Koga, HÉROS Masqué SDHS-FR042

Only Invokable Specifically with "Mask Change" and not Invokable Specifically otherwise. This card gains 500 ATK for each monster controlled by your opponent. Once per turn, during each player’s turn, you can banish 1 "HERO" monster from your Graveyard, then target 1 face-up monster on the Field, until the end of this turn, the target loses ATK equal to the ATK of the banished monster to activate this effect.