Cannot be Normal Summoned /Set. Must be Special Summoned with "Contract with Exodia". and cannot be Special Summoned other ways. Cannot be destroyed by battle or Spell/Trap effect. Once per turn, during your Standby Phases, this card gains 500 ATK. Destroy this card unless all 5 of these cards are in the Graveyard - "Exodia the Forbidden One", "Right Arm of the Forbidden One", "Left Arm of the Forbidden One", "Right Leg of the Forbidden One" or "Left Leg of the Forbidden One".