Koga, HEROS Masqué AP08-FR022

Only Invocable Specially with "Mask Change" and not Invocable Specially 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, the target loses ATK equal to the ATK of the banished monster to activate this effect.