| trans_name = Duel Fusion - Battle Fusion
| image = BattleFusion-DRLG-EN-SR-1E.png
| attribute card_type = Spell| typest property = Quick-Play| number passcode = 43225434
| effect_types = Activation requirement, Effect, Condition
| lore = When an [[attack]] is [[declare]]d involving a [[Fusion Monster]] you [[control]] and an opponent's [[Monster Card|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]].