Performapal Clay Breaker

If this Tribute Summoned card battles an opponent's monster, during damage calculation: You can make that opponent's monster lose 500 ATK for each face-up Pendulum Monster currently in your Extra Deck, until the end of this turn. When you Pendulum Summon 2 or more monsters at the same time while this card is in your GY: You can add this card from the GY to your hand. You can only use each effect of "Performapal Clay Breaker" once per turn.