Evil HERO Doom Prison

If you control a Fusion Monster that must be Special Summoned with "Dark Fusion", you can Special Summon this card (from your hand). You can only Special Summon "Evil HERO Doom Prison" once per turn this way. You can send 1 "HERO" monster from your Deck to the GY; this turn, if this face-up card is used as material for the Fusion Summon of a "HERO" monster, it can be used as a substitute for any 1 Fusion Material whose name is mentioned on it, but the other materials must be correct. You can only use this effect of "Evil HERO Doom Prison" once per turn.