Effect
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.
This effect does not target.
You cannot activate this card when declaring an attack against a face-down Defense Position monster or a monster with 0 ATK.
Even if the attack target is changed due to a replay, the ATK increase from the effect of "Duelist Fusion" remains applied until the end of the Damage Step.
If an attack is canceled due to a replay, the ATK increase is no longer applied.
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