Tenyi Spirit - Nahata

“If you control no Effect Monsters: You can Special Summon this card from your hand. When an attack is declared involving your face-up non-Effect Monster and an opponent's face-up monster: You can banish this card from your hand or GY; that opponent's monster loses 1500 ATK until the end of this turn. You can only use each effect of "Tenyi Spirit - Nahata" once per turn.”