Exodia Necross

Cannot be Normal Summoned/Set. Must be Special Summoned with "Contract with Exodia". Cannot be destroyed by battle or Spell/Trap effects. Once per turn, during your Standby Phase: This card gains 500 ATK. Destroy this card unless all 5 of these cards are in your GY, "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".