Eternal Galaxy
Normal TrapIf you control a "Photon" or "Galaxy" monster: Target 1 Xyz Monster you control; Special Summon from your Extra Deck, 1 "Photon" or "Galaxy" Xyz Monster that is 4 Ranks higher than that target, by using that target as material. (This is treated as an Xyz Summon. Transfer its materials to the Summoned monster.) You can only activate 1 "Eternal Galaxy" per turn.
Galaxy Brave
Level 8 LIGHT/Warrior Effect0 ATK / 0 DEF
If this card is in your hand: You can reveal 1 "Photon" monster in your hand; Special Summon this card, and if you do, its Level becomes the Level of that "Photon" monster. If this card is Normal or Special Summoned: You can target 1 "Galaxy" monster in your GY; this card's ATK/DEF become that monster's ATK/DEF. You can only use each effect of "Galaxy Brave" once per turn.
Galaxy Cleric
Level 4 LIGHT/Spellcaster Effect1500 ATK / 600 DEF
If this card is in your hand: You can target 1 "Photon" or "Galaxy" Xyz Monster you control; attach this card to it as material. If this card is Normal or Special Summoned: You can target 5 "Photon" and/or "Galaxy" cards with different names in your GY; shuffle them into the Deck, then draw 2 cards. You can only use 1 "Galaxy Cleric" effect per turn, and only once that turn.
Galaxy Cyclone
Normal SpellTarget 1 Set Spell/Trap on the field; destroy it. During your Main Phase, except the turn this card was sent to the GY: You can banish this card from your GY, then target 1 face-up Spell/Trap on the field; destroy it. You can only use this effect of "Galaxy Cyclone" once per turn.
Galaxy Defense Robot Orbital 7
Level 8 LIGHT/Machine Effect2000 ATK / 2000 DEF
You can Tribute this card from your hand or field; take 1 "Photon" monster and 1 "Galaxy" monster from your Deck, add 1 of them to your hand, and send the other to the GY, also you cannot Special Summon for the rest of this turn, except LIGHT monsters. If a "Galaxy-Eyes" monster(s) is Special Summoned to your field (except during the Damage Step): You can Special Summon this card from your GY, but banish it when it leaves the field. You can only use each effect of "Galaxy Defense Robot Orbital 7" once per turn.
Galaxy Dragon
Level 4 LIGHT/Dragon Effect2000 ATK / 1200 DEF
This card cannot attack directly, and can only attack Dragon-Type monsters. If this card battles a Dragon-Type monster, this card gains 1000 ATK during the Damage Step only, also that monster has its effects negated during this Battle Phase, as long as this card remains face-up on the field.
Galaxy Expedition
Normal SpellIf you control a Level 5 or higher "Photon" or "Galaxy" monster: Special Summon 1 Level 5 or higher "Photon" or "Galaxy" monster from your Deck in Defense Position. You can only activate 1 "Galaxy Expedition" per turn.
Galaxy Hundred
Continuous SpellWhen this card is activated: You can send 1 "Photon" or "Galaxy" card from your Deck to the GY. If "Galaxy-Eyes Photon Dragon" is Special Summoned to your field (except during the Damage Step): You can look at your opponent's Extra Deck, then you can apply 1 of these effects.
â—Ź Banish 1 monster from it.
â—Ź Special Summon 1 "Number" monster from it to your field.
You can only use this effect of "Galaxy Hundred" once per turn. You can only activate 1 "Galaxy Hundred" per turn.
Galaxy Journey
Quick-Play SpellSpecial Summon 1 of your banished LIGHT or DARK monsters. If a face-up Xyz Monster(s) you control is banished, while this card is in your GY (except during the Damage Step): You can banish this card, then target 1 of those monsters; Special Summon it. You can only use each effect of "Galaxy Journey" once per turn.
Galaxy Knight
Level 8 LIGHT/Warrior Effect2800 ATK / 2600 DEF
If you control a "Photon" or "Galaxy" monster, you can Normal Summon this card without Tributing. If Summoned this way: Target 1 "Galaxy-Eyes Photon Dragon" in your GY (if possible); regardless, this card loses 1000 ATK, and if it does, Special Summon that target (if any) in Defense Position. This ATK decrease lasts until the end of this turn.
Galaxy Mirror Sage
Level 3 LIGHT/Spellcaster Flip Effect0 ATK / 800 DEF
FLIP: You gain 500 LP for each "Galaxy" monster in your Graveyard.
When this card is destroyed and sent from the field to the Graveyard after being flipped face-up: You can Special Summon 1 Level 4 or lower "Galaxy" monster from your Deck or Graveyard in face-down Defense Position. Banish it when it leaves the field.
Galaxy Photon Dragon 15
Level 4 LIGHT/Dragon Xyz Effect2000 ATK / 0 DEF
2 Level 4 monsters
Other LIGHT monsters you control gain 500 ATK. You can only use each of the following effects of "Galaxy Photon Dragon" once per turn. You can detach 1 material from this card; either add 1 "Photon" or "Galaxy" card from your Deck to your hand, or send it to the GY. If a LIGHT monster(s) is Special Summoned to your field (except during the Damage Step): You can target 1 of those monsters; its Level becomes 4 or 8 until the end of this turn.
Galaxy Queen's Light
Normal SpellTarget 1 face-up Level 7 or higher monster you control; the Levels of all other face-up monsters you currently control become the current Level of that monster, until the End Phase.
Galaxy Satellite Dragon
Link 2 DARK/Dragon Link Effect2000 ATK
2 Dragon monsters
During the Battle Phase (Quick Effect): You can banish this card from your field or GY, then target 1 "Number" Xyz Monster you control whose original Attribute/Type are LIGHT/Dragon; until the end of the Battle Phase, its ATK becomes equal to the value of the "Number" in its name x 100, also any battle damage your opponent takes is halved. During your opponent's End Phase: You can choose 1 card from your Deck and place it on top of your Deck. You can only use each effect of "Galaxy Satellite Dragon" once per turn.
Galaxy Serpent
Level 2 LIGHT/Dragon Tuner Normal1000 ATK / 0 DEF
Your hopes and dreams will be refreshed if you catch a glimpse of this rare creature in the evening twilight, soaring in the Sea of Stars.
Galaxy Soldier
Level 5 LIGHT/Machine Effect2000 ATK / 0 DEF
You can send 1 other LIGHT monster from your hand to the GY; Special Summon this card from your hand in Defense Position. When this card is Special Summoned: You can add 1 "Galaxy" monster from your Deck to your hand. You can only use this effect of "Galaxy Soldier" once per turn.
Galaxy Stealth Dragon
Level 4 DARK/Dragon Xyz Effect2000 ATK / 1600 DEF
2 Level 4 Dragon-Type monsters
Once per turn: You can detach 1 Xyz Material from this card; Special Summon 1 Dragon-Type monster from your hand. Your opponent cannot target other "Galaxy" cards you control with card effects, also those cards cannot be destroyed by your opponent's card effects.
Galaxy Storm
Quick-Play SpellTarget 1 face-up Xyz Monster on the field that has no Xyz Material; destroy that target.
Galaxy Summoner
Level 4 LIGHT/Spellcaster Effect1600 ATK / 1400 DEF
If this card is Normal or Special Summoned: You can target 1 "Photon" or "Galaxy" monster in your GY, except "Galaxy Summoner"; Special Summon it in Defense Position. You can target 1 other LIGHT monster you control; it becomes Level 4 until the end of this turn. You can only use each effect of "Galaxy Summoner" once per turn.
Galaxy Trance
Normal SpellPay 2000 LP, then target 1 "Photon" monster in your GY; Special Summon both it and 1 "Galaxy" monster from your Deck, with the same Level, both in Defense Position, and if you do, each monster's ATK become 2000, also their effects are negated. You can only activate 1 "Galaxy Trance" per turn. You cannot Normal or Special Summon monsters during the turn you activate this card, except "Photon" and "Galaxy" monsters.
Galaxy Tyranno
Level 8 LIGHT/Dinosaur Effect2000 ATK / 0 DEF
When a "Galaxy" monster you control is targeted for an attack: You can Special Summon this card from your hand in Defense Position. When Summoned this way, you can: Immediately after this effect resolves, Xyz Summon 1 "Galaxy" Xyz Monster, using only "Galaxy" monsters you control.
Galaxy War Drake
Level 4 LIGHT/Dragon Effect1500 ATK / 1000 DEF
If a Level 4 LIGHT monster(s) is Special Summoned to your field (except during the Damage Step): You can Special Summon this card from your hand or GY, but banish it when it leaves the field. You can target 1 other Level 4 LIGHT monster you control; the Levels of both that monster and this card become 8 until the end of this turn. You can only use each effect of "Galaxy War Drake" once per turn, also you cannot Special Summon the turn you activate either of this card's effects, except LIGHT monsters.
Galaxy Wave
Continuous SpellEach time you Xyz Summon: Inflict 500 damage to your opponent.
Galaxy Wizard
Level 4 LIGHT/Spellcaster Effect0 ATK / 1800 DEF
Once per turn: You can increase this card's Level by 4 until the end of this turn. You can Tribute this card; add 1 "Galaxy" card from your Deck to your hand, except "Galaxy Wizard".
Galaxy Worm
Level 3 LIGHT/Insect Effect1200 ATK / 1000 DEF
When this card is Normal Summoned while you control no other monsters: You can Special Summon 1 Level 3 or lower "Galaxy" Effect Monster from your Deck, but it has its effects negated.
Galaxy Zero
Equip SpellTarget 1 "Photon" or "Galaxy" monster in your Graveyard; Special Summon it in face-up Attack Position and equip it with this card. It cannot attack or activate its effects. If it would be destroyed during the Battle Phase, you can destroy this card instead. When this card leaves the field: The equipped monster's ATK becomes 0. You can only activate 1 "Galaxy Zero" per turn.
Galaxy-Eyes Afterglow Dragon
Level 8 LIGHT/Dragon Effect3000 ATK / 2500 DEF
If you control a "Galaxy-Eyes" monster: You can Special Summon this card from your hand in Defense Position. If this card is detached from an Xyz Monster to activate that monster's effect: You can take 1 "Galaxy-Eyes Photon Dragon" from your hand or Deck, and either Special Summon it, or attach it to an Xyz Monster you control as material, then if you activated this effect during the Battle Phase, double the ATK of all "Number" Xyz Monsters you control. You can only use each effect of "Galaxy-Eyes Afterglow Dragon" once per turn.
Galaxy-Eyes Antimatter Dragon
Level 9 LIGHT/Dragon Xyz Effect4000 ATK / 0 DEF
2 Level 9 monsters
Once per turn, you can also Xyz Summon "Galaxy-Eyes Antimatter Dragon" by using an Xyz Monster you control with 3 or more materials (transfer its materials). Any battle damage this card with material inflicts to your opponent is halved. You can detach 1 material from this card; this card gains the ability this turn to make up to 2 attacks on monsters during each Battle Phase, then if the detached material was a monster, you can send 1 monster with its same Type from your Deck to the GY.
Galaxy-Eyes Cipher Blade Dragon
Level 9 LIGHT/Dragon Xyz Effect3200 ATK / 2800 DEF
3 Level 9 monsters
You can also Xyz Summon this card by using a Rank 8 "Galaxy-Eyes" Xyz Monster you control as material. (Transfer its materials to this card.) Cannot be used as material for an Xyz Summon. Once per turn: You can detach 1 material from this card, then target 1 card on the field; destroy it. If this Xyz Summoned card you control, is destroyed by battle with an opponent's attacking monster, or destroyed by an opponent's card effect, and sent to your GY: You can target 1 "Galaxy-Eyes Cipher Dragon" in your GY; Special Summon it.
Galaxy-Eyes Cipher Dragon
Level 8 LIGHT/Dragon Xyz Effect3000 ATK / 2500 DEF
2 Level 8 monsters
Once per turn: You can detach 1 Xyz Material from this card, then target 1 face-up monster your opponent controls; monsters you control cannot attack your opponent directly for the rest of this turn, except this card, also take control of the targeted monster until the End Phase, but while this effect is applied, it has its effects negated, its ATK becomes 3000, also its name becomes "Galaxy-Eyes Cipher Dragon".
Galaxy-Eyes Cipher X Dragon
Level 10 LIGHT/Dragon Xyz Effect4000 ATK / 3000 DEF
2 Level 10 monsters
Once per turn, you can also Xyz Summon "Galaxy-Eyes Cipher X Dragon" by using a "Cipher Dragon" monster you control as material. (Transfer its materials to this card.) You can detach 2 materials from this card; your opponent cannot target LIGHT monsters you control with card effects, until the end of your opponent's turn. Once per turn, during your Standby Phase: You can return 1 Rank 9 or lower Dragon Xyz Monster from your GY to the Extra Deck, then you can Special Summon that monster from your Extra Deck, by using this card you control as material. (This is treated as an Xyz Summon. Transfer this card's materials to the Summoned monster.)
Galaxy-Eyes Cloudragon
Level 1 LIGHT/Dragon Effect300 ATK / 250 DEF
You can Tribute this card; Special Summon 1 "Galaxy-Eyes" monster from your hand or Graveyard, except "Galaxy-Eyes Cloudragon". You can only use this effect of "Galaxy-Eyes Cloudragon" once per turn. If this card is in the Graveyard: You can target 1 "Galaxy-Eyes" Xyz Monster you control; attach this card to it as an Xyz Material. You can only use this effect of "Galaxy-Eyes Cloudragon" once per Duel.
Galaxy-Eyes Full Armor Photon Dragon
Level 8 LIGHT/Dragon Xyz Effect4000 ATK / 3500 DEF
3 Level 8 monsters
You can also Xyz Summon this card by using a "Galaxy-Eyes" Xyz Monster you control as material, except "Galaxy-Eyes Full Armor Photon Dragon". (Transfer its materials to this card.) Once per turn: You can target up to 2 Equip Cards equipped to this card; attach them to this card as material. Once per turn: You can detach 1 material from this card, then target 1 face-up card your opponent controls; destroy it.
Galaxy-Eyes Photon Change Dragon
Level 8 LIGHT/Dragon Effect3000 ATK / 2500 DEF
You can Special Summon this card (from your hand) by Tributing 2 face-up monsters on either field with 2000 or more ATK, including a monster you control. You can only Special Summon "Galaxy-Eyes Photon Change Dragon" once per turn this way. During the Main Phase (Quick Effect): You can banish this card you control; Special Summon 1 "Galaxy-Eyes Photon Dragon" from your Deck or GY, then you can banish 1 monster your opponent controls that was Special Summoned from the Extra Deck until the End Phase. You can only use this effect of "Galaxy-Eyes Photon Change Dragon" once per turn.
Galaxy-Eyes Photon Dragon
Level 8 LIGHT/Dragon Effect3000 ATK / 2500 DEF
You can Special Summon this card (from your hand) by Tributing 2 monsters with 2000 or more ATK. During the Battle Step, if this card battles an opponent's monster (Quick Effect): You can target that opponent's monster; banish both this card from the field and that target. Return those banished monsters to the field at the end of the Battle Phase, and if you banished an Xyz Monster, this card gains 500 ATK for each material it had when it was banished.
Galaxy-Eyes Solflare Dragon
Link 2 LIGHT/Dragon Link Effect2000 ATK
2 LIGHT monsters, including a monster with 2000 or more ATK
If this card is Link Summoned: You can target 1 "Photon" or "Galaxy" monster in your GY; add it to your hand. During your opponent's Main Phase (Quick Effect): You can discard 1 "Photon" card and 1 "Galaxy" card, OR discard 1 "Galaxy-Eyes Photon Dragon", then target 1 Special Summoned monster your opponent controls; destroy it. You can only use each effect of "Galaxy-Eyes Solflare Dragon" once per turn.
Galaxy-Eyes Tachyon Primal
Level 8 LIGHT/Dragon Effect3000 ATK / 2500 DEF
If a Dragon Xyz Monster declares an attack: Attach this card on the field to it as material. You can only use each of the following effects of "Galaxy-Eyes Tachyon Primal" once per turn. If a Dragon Xyz Monster is on the field (Quick Effect): You can Special Summon this card from your hand to either field. If this card is Normal or Special Summoned: The owner of this card adds 1 "Tachyon" Spell/Trap from their Deck to their hand.
Hyper Galaxy
Quick-Play SpellTribute 1 monster with 2000 or more ATK, except "Galaxy-Eyes Photon Dragon", then target 1 monster your opponent controls with 2000 or more ATK; Tribute it, and if you do, Special Summon 1 "Galaxy-Eyes Photon Dragon" from your hand, Deck, or GY. You can only activate 1 "Hyper Galaxy" per turn.
Lord of the Tachyon Galaxy
Normal TrapIf you control a "Galaxy-Eyes Tachyon Dragon" monster, you can activate this card from your hand. During the Battle Phase: Detach 1 material from your "Galaxy-Eyes" Xyz Monster; shuffle all monsters your opponent controls that were Normal or Special Summoned this turn into the Deck. If you control a "Number C" monster, this card's activation and effect cannot be negated. You can only activate 1 "Lord of the Tachyon Galaxy" per turn.
Neo Galaxy-Eyes Cipher Dragon
Level 9 LIGHT/Dragon Xyz Effect4500 ATK / 3000 DEF
3 Level 9 monsters
If this card has a "Cipher" card as Xyz Material, it gains this effect.
â—Ź Once per turn: You can detach up to 3 Xyz Materials from this card; monsters you control cannot attack your opponent directly for the rest of this turn, except this card, also for each Material detached, take control of 1 opponent's face-up monster until the End Phase, but while this effect is applied, they have their effects negated, their ATK's become 4500, also their names become "Neo Galaxy-Eyes Cipher Dragon".
Neo Galaxy-Eyes Photon Dragon
Level 8 LIGHT/Dragon Xyz Effect4500 ATK / 3000 DEF
3 Level 8 monsters
If this card is Xyz Summoned using "Galaxy-Eyes Photon Dragon" as any of its materials: All other face-up cards currently on the field have their effects negated. Once per turn: You can detach 1 material from this card; detach all materials from monsters your opponent controls, then this card gains 500 ATK for each, also it can attack up to that many times during each Battle Phase this turn.
Neo Galaxy-Eyes Photon Dragon - Photon Howling
Level 8 LIGHT/Dragon Xyz Effect4500 ATK / 3000 DEF
3 Level 8 monsters
Once per turn, you can also Xyz Summon "Neo Galaxy-Eyes Photon Dragon - Photon Howling" by using 1 Rank 8 Xyz Monster you control (transfer its materials). If this card is Xyz Summoned: You can take 1 "Photon" monster from your Deck, and either Special Summon it in Defense Position or attach it to this card as material. (Quick Effect): You can detach 3 materials from this card; Tribute 1 other Xyz Monster, and if you do, negate the effects of all other face-up cards currently on the field until the end of this turn.
Number 107: Galaxy-Eyes Tachyon Dragon
Level 8 LIGHT/Dragon Xyz Effect3000 ATK / 2500 DEF
2 Level 8 monsters
Once per Battle Phase, at the start of your Battle Phase: You can detach 1 material from this card; all other face-up monsters currently on the field have their effects negated, also their ATK/DEF become their original ATK/DEF, and if you do any of these, during the Battle Phase this turn, each time an opponent's card effect resolves, this card gains 1000 ATK until the end of the Battle Phase, also, it can make a second attack during each Battle Phase this turn.
Number 38: Hope Harbinger Dragon Titanic Galaxy 20
Level 8 LIGHT/Dragon Xyz Effect3000 ATK / 2500 DEF
2 Level 8 monsters
Once per turn, when a Spell Card or effect is activated on the field (Quick Effect): You can negate that effect, and if you do, attach that card to this card as material. When an opponent's monster declares an attack: You can detach 1 material from this card; change the attack target to this card and perform damage calculation. If a face-up Xyz Monster(s) you control is destroyed by battle or card effect: You can target 1 face-up Xyz Monster you control; it gains ATK equal to 1 of those destroyed monster's original ATK.
Number 42: Galaxy Tomahawk 
Level 7 WIND/Machine Xyz Effect0 ATK / 3000 DEF
2 Level 7 monsters
Once per turn: You can detach 2 Xyz Materials from this card; Special Summon as many "Battle Eagle Tokens" (Machine-Type/WIND/Level 6/ATK 2000/DEF 0) as possible, destroy them during the End Phase of this turn, also your opponent takes no further battle damage this turn.
Number 62: Galaxy-Eyes Prime Photon Dragon
Level 8 LIGHT/Dragon Xyz Effect4000 ATK / 3000 DEF
2 Level 8 monsters
If this card battles, during damage calculation (Quick Effect): You can detach 1 material from this card once per battle; this card gains ATK equal to the combined Ranks of all Xyz Monsters currently on the field x 200, during that damage calculation only. If this card in its owner's control is destroyed by an opponent's card effect while it has "Galaxy-Eyes Photon Dragon" as Xyz Material: You can Special Summon this card during your 2nd Standby Phase after activation and double its ATK. Any battle damage this card inflicts to your opponent is halved unless it has "Galaxy-Eyes Photon Dragon" as Xyz Material.
Number 83: Galaxy Queen
Level 1 DARK/Spellcaster Xyz Effect500 ATK / 500 DEF
3 Level 1 monsters
Once per turn: You can detach 1 Xyz Material from this card; until the opponent's next End Phase, the monsters you currently control cannot be destroyed by battle, and if they attack a Defense Position monster, inflict piercing battle damage to your opponent.
Number 90: Galaxy-Eyes Photon Lord 10
Level 8 LIGHT/Warrior Xyz Effect2500 ATK / 3000 DEF
2 Level 8 monsters
If this card has a "Photon" card as material, it cannot be destroyed by card effects. You can only use each of the following effects of "Number 90: Galaxy-Eyes Photon Lord" once per turn.
â—Ź When an opponent's monster activates its effect (Quick Effect): You can detach 1 material from this card; negate that monster's effect, and if the detached material was a "Galaxy" card, destroy that card.
â—Ź During your opponent's turn (Quick Effect): You can take 1 "Photon" or "Galaxy" card from your Deck, and either add it to your hand or attach it to this card as material.
Number 95: Galaxy-Eyes Dark Matter Dragon 50
Level 9 DARK/Dragon Xyz Effect4000 ATK / 0 DEF
3 Level 9 monsters
You can also Xyz Summon this card by using a "Galaxy-Eyes" Xyz Monster you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) Cannot be used as an Xyz Material for an Xyz Summon. When this card is Xyz Summoned: You can send 3 Dragon-Type monsters with different names from your Deck to the Graveyard; your opponent banishes 3 monsters from their Deck. You can detach 1 Xyz Material from this card; this card can make up to 2 attacks on monsters during each Battle Phase this turn.
Number C107: Neo Galaxy-Eyes Tachyon Dragon
Level 9 LIGHT/Dragon Xyz Effect4500 ATK / 3000 DEF
3 Level 9 monsters
Once per turn: You can detach 1 Xyz Material from this card; until the end of this turn, negate the effects of all other face-up cards currently on the field, also your opponent cannot activate cards or effects on the field. If this card has "Number 107: Galaxy-Eyes Tachyon Dragon" as an Xyz Material, it gains this effect.
â—Ź You can Tribute 2 monsters; this card can make up to 3 attacks on monsters during each Battle Phase this turn.
Number C62: Neo Galaxy-Eyes Prime Photon Dragon
Level 8 LIGHT/Dragon Xyz Effect4000 ATK / 3000 DEF
3 Level 8 LIGHT monsters
You can also Xyz Summon this card by using "Number 62: Galaxy-Eyes Prime Photon Dragon" you control. (Transfer its materials to this card.) At the start of your Battle Phase: You can detach 1 material from this card; this card can make up to 3 attacks on monsters during this Battle Phase. If this card has "Galaxy-Eyes Photon Dragon" as material, it gains these effects.
â—Ź Unaffected by your opponent's monster effects.
â—Ź Gains ATK equal to the combined Levels/Ranks of its attached materials x 100.
Number S38: Titanic Galaxy
Level 9 LIGHT/Dragon Xyz Effect3000 ATK / 2500 DEF
3 Level 9 LIGHT monsters
You can also Xyz Summon this card by using "Number 38: Hope Harbinger Dragon Titanic Galaxy" you control (transfer its materials to this card). Gains 200 ATK for each material attached to it. Once per turn: You can target up to 2 Spells/Traps your opponent controls; attach them to this card as material. Neither player can activate those cards or their effects in response to this effect's activation. You can detach 1 material from this card; until the end of this turn, this card's original ATK becomes 1500, also it can attack directly.
Superdimensional Robot Galaxy Destroyer
Level 10 LIGHT/Machine Xyz Effect5000 ATK / 2000 DEF
3 Level 10 monsters
Once per turn: You can detach 1 Xyz Material from this card; destroy all Spell and Trap Cards your opponent controls. Your opponent cannot activate Spell/Trap Cards in response to this effect's activation.
Tachyon Spiral Galaxy
Normal TrapTarget 1 Dragon "Galaxy" monster you control; until the end of this turn, it cannot be destroyed by battle, also it is unaffected by other card effects, except its own. You can only activate 1 "Tachyon Spiral Galaxy" per turn. If you control a "Galaxy-Eyes Tachyon Dragon" monster, you can activate this card from your hand.