Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand or face-up Extra Deck) by Tributing all monsters you control (min. 2), including a Dragon Pendulum Monster. You can only Special Summon "All-Eyes Phantom Dragon" once per turn this way. Once per turn, during damage calculation, if this card battles an opponent's monster: Double this card's current ATK until the end of this turn. Once per turn, when your opponent activates a Spell/Trap Card or effect (Quick Effect): You can send 1 Spell/Trap you control to the GY; negate the activation.