A Legendary Ocean

(This card's name is always treated as "Umi".)
All WATER monsters on the field gain 200 ATK/DEF. Reduce the Level of all WATER monsters in both players' hands and on the field by 1.

Al-Lumi'raj

All monsters on the field lose ATK and DEF equal to their own Level/Rank x 300.

Cairngorgon, Antiluminescent Knight

2 Level 4 monsters
During either player's turn, when another card or effect is activated that targets exactly 1 card on the field (and no other cards): You can detach 1 Xyz Material from this card, then target another card on the field that would be an appropriate target for that card/effect; that card/effect now targets the new target.

Cosmic Tree Irmistil

3+ Effect Monsters
You can only control 1 "Cosmic Tree Irmistil". Each time your opponent Special Summons a monster(s) face-up during the Main Phase, you gain LP equal to their ATK. Once per turn (Quick Effect): You can pay LP in multiples of 1000 (max. 3000); this card gains that much ATK.

Heavymetalfoes Electrumite

2 Pendulum Monsters
If this card is Link Summoned: You can add 1 Pendulum Monster from your Deck to your Extra Deck face-up. Once per turn: You can target 1 other face-up card you control; destroy it, then add 1 face-up Pendulum Monster from your Extra Deck to your hand. If a card(s) in your Pendulum Zone leaves the field: Draw 1 card. You can only use this effect of "Heavymetalfoes Electrumite" once per turn.

Hinezumi Hanabi

Cannot be used as a material for a Fusion, Synchro, Xyz, or Link Summon. If this card is Normal or Special Summoned: Place 6 counters on it. Once per turn, during your End Phase: Give control of this card to your opponent. Once per turn, if control of this face-up card with a counter(s) changes: Roll a six-sided die, remove as many counters from this card as possible, up to the result, and if all of this card's counters are removed by this effect, destroy this card, and if you do, take 2000 damage.

Humid Winds

You can pay 1000 LP; add 1 "Aroma" monster from your Deck to your hand. If your LP is lower than your opponent's: You can gain 500 LP. You can only use each effect of "Humid Winds" once per turn.

Landoise's Luminous Moss

Activate only if you control a face-up "Naturia" monster. The opponent's Effect Monsters cannot activate their effects this turn.

Lemuria, the Forgotten City

This card's name is treated as "Umi". All WATER monsters gain 200 ATK and DEF. Once per turn, during your Main Phase: You can have all WATER monsters you currently control gain Levels equal to the number of WATER monsters you currently control, until the End Phase.

Lumina, Lightsworn Summoner

Once per turn: You can discard 1 card, then target 1 Level 4 or lower "Lightsworn" monster in your GY; Special Summon that target. Once per turn, during your End Phase: Send the top 3 cards of your Deck to the GY.

Lumina, Twilightsworn Shaman

Once per turn: You can banish 1 "Lightsworn" monster from your hand or GY, then target 1 of your banished "Lightsworn" monsters, except "Lumina, Twilightsworn Shaman"; Special Summon it. Once per turn, if your other "Lightsworn" monster's effect is activated: Send the top 3 cards of your Deck to the GY.

Luminous Dragon Ritual

This card is used to Ritual Summon "Paladin of Photon Dragon". You must also Tribute monsters from your hand or field whose total Levels equal exactly 4. You can banish this card from your Graveyard; banish monsters from your Graveyard whose total Levels equal exactly 4, and Special Summon 1 "Paladin of Photon Dragon" from your hand after that. (This Special Summon is treated as a Ritual Summon.)

Luminous Soldier

If this card battles a DARK monster, increase the ATK of this card by 500 points during the Damage Step only.

Luminous Spark

All LIGHT monsters gain 500 ATK and lose 400 DEF.

Number 10: Illumiknight

3 Level 4 monsters
Once per turn: You can detach 1 Xyz Material from this card; send 1 card from your hand to the Graveyard, and if you do, draw 1 card.

Numinous Healer

You can only activate this card when you take damage to your Life Points. Increase your Life Points by 1000 points. Also, increase your Life Points by 500 points for each "Numinous Healer" card in your Graveyard.

Pacifis, the Phantasm City

(This card's name is always treated as "Umi".)
You cannot Normal or Special Summon Effect Monsters the turn you activate either of this card's effects (even if this card leaves the field). Once per turn, if you Normal or Special Summon exactly 1 Normal Monster (and no other cards): Add 1 "Phantasm Spiral" card from your Deck to your hand. If your opponent activates a card or effect (except during the Damage Step), and you control no Tokens: You can Special Summon 1 "Phantasm Spiral Token" (Wyrm-Type/WATER/Level 8/ATK 2000/DEF 2000).

Seleglare the Luminous Lunar Dragon

You can Normal Summon/Set this card without Tributing, but its original ATK becomes 1500. During the Main Phase (Quick Effect): You can target 1 monster your opponent controls with ATK less than or equal to this card; return this card to the hand, and if you do, take control of that opponent's monster until the End Phase. You can only use this effect of "Seleglare the Luminous Lunar Dragon" once per turn.

Sosei Ryu-Ge Mistva

[ Pendulum Effect ]
During your Main Phase: You can add 1 non-Pendulum "Ryu-Ge" card from your Deck to your hand, then destroy this card. You can only use this effect of "Sosei Ryu-Ge Mistva" once per turn.

Must be Special Summoned by its own effect. You can only Special Summon "Sosei Ryu-Ge Mistva(s)" once per turn. If a monster(s) on the field is destroyed by battle or card effect, while this card is in your Extra Deck: You can Tribute 1 Level 10 "Ryu-Ge" monster, and if you do, Special Summon this card (this is treated as a Ritual Summon), then you can apply this effect.
● Destroy up to 2 cards you control, and if you do, place up to that many "Ryu-Ge" Continuous Spells from your Deck face-up on your field.

Stardust Illumination

Send 1 "Stardust" monster from your Deck to the GY, or if you control "Stardust Dragon" or a Synchro Monster that mentions it, you can Special Summon it instead. You can banish this card from your GY, then target 1 "Stardust" monster you control; increase or decrease its Level by 1 until the end of this turn. You can only use each effect of "Stardust Illumination" once per turn.

Ultimate Flagship Ursatron

(This card is always treated as an "Ursarctic" and "Drytron" card.)
Must be Special Summoned with "Ursarctic Drytron". Once per turn, if another Effect Monster is Special Summoned to your field (except during the Damage Step): You can add 1 "Ursarctic" or "Drytron" monster from your Deck to your hand. Once per turn: You can target 1 of your banished "Ursarctic" or "Drytron" monsters; add it to your hand.

Umi

All Fish, Sea Serpent, Thunder, and Aqua monsters on the field gain 200 ATK/DEF, also all Machine and Pyro monsters on the field lose 200 ATK/DEF.

Umiiruka

Increase the ATK of all WATER monsters by 500 points and decrease their DEF by 400 points.

Uminotaurus

If a Fish, Sea Serpent, or Aqua-Type monster you control attacks a Defense Position monster, inflict piercing battle damage to your opponent.