Contract with Exodia
Normal SpellIf you have all 5 of "Exodia the Forbidden One", "Right Arm of the Forbidden One", "Left Arm of the Forbidden One", "Right Leg of the Forbidden One", and "Left Leg of the Forbidden One" in your Graveyard: Special Summon 1 "Exodia Necross" from your hand.
Exodia Necross
Level 4 DARK/Spellcaster Effect1800 ATK / 0 DEF
Cannot be Normal Summoned/Set. Must be Special Summoned with "Contract with Exodia", and cannot be Special Summoned by other ways. Cannot be destroyed by battle or Spell/Trap effect. Once per turn, during your Standby Phase: This card gains 500 ATK. Destroy this card unless all 5 of these cards are in your Graveyard - "Exodia the Forbidden One", "Right Arm of the Forbidden One", "Left Arm of the Forbidden One", "Right Leg of the Forbidden One" and "Left Leg of the Forbidden One".
Exodia the Forbidden One 
Level 3 DARK/Spellcaster Effect1000 ATK / 1000 DEF
If you have "Right Leg of the Forbidden One", "Left Leg of the Forbidden One", "Right Arm of the Forbidden One" and "Left Arm of the Forbidden One" in addition to this card in your hand, you win the Duel.
Exodia, the Legendary Defender
Level 10 DARK/Spellcaster Effect? ATK / ? DEF
Cannot be Special Summoned. You can Tribute 5 monsters to Tribute Summon (but not Set) this card. This card's ATK/DEF become the combined original ATK/DEF of the Tributed monsters. If this card Summoned this way destroys a DARK Fiend monster owned by your opponent, you win the Duel at the end of the Damage Step.
The Legendary Exodia Incarnate
Level 10 DARK/Spellcaster Effect? ATK / 0 DEF
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by Tributing 1 "Forbidden One" monster, and cannot be Special Summoned by other ways. This card gains 1000 ATK for each "Forbidden One" monster in your Graveyard. Unaffected by other cards' effects. Once per turn, during your End Phase: Add 1 "Forbidden One" monster from your Graveyard to your hand. When this card is destroyed by battle and sent to the Graveyard: You can reveal any number of "Forbidden One" monsters in your hand, and if you do, draw 1 card for each.
The Unstoppable Exodia Incarnate 20
Level 10 DARK/Spellcaster Fusion Effect? ATK / 0 DEF
5 "Forbidden One" monsters
Cannot be destroyed by an opponent's card effects. Once per turn, if this card battles, during damage calculation: You can make this card gain ATK equal to your LP. Once per turn, when a Spell/Trap Card or effect is activated (Quick Effect): You can negate that activation. Once per turn, during the End Phase: You can Set 1 "Exodd" or "Obliterate!!!" Spell/Trap from your Deck. Once per turn, during your Standby Phase: Lose 1000 LP.
True Exodia
Level 1 DARK/Spellcaster Effect0 ATK / 0 DEF
If the only monsters on the field are this card you control and 4 "Forbidden One" Normal Monsters with different names, your opponent wins the Duel.