YuGiOh Fusion Enforcers Super Rare Battle Fusion FUEN-EN056

Activationrequirement Effect Condition. Quick-Play. When an attack is declared involving a Fusion Monster you control and an opponent's monster: That monster you control gains ATK equal to the ATK of the opponent's monster, until the end of the Damage Step. You can only activate 1 "Battle Fusion" per turn.