Odd-Eyes Phantasma Dragon

If you have 2 cards in your Pendulum Zones and a face-up "Odd-Eyes" Pendulum Monster in your Extra Deck: You can Special Summon this card from your hand. You cannot Pendulum Summon the turn you activate this effect. During damage calculation, if this card attacks an opponent's monster: You can make that opponent's monster lose 1000 ATK for each face-up Pendulum Monster in your Extra Deck, during damage calculation only. You can only use each effect of "Odd-Eyes Phantasma Dragon" once per turn.