Zalamander Catalyzer - 25th Anniversary Tin: Dueling Heroes Mega Pack (MP23)

You can reveal this card and 1 Fiend monster in your hand; Special Summon 1 of them and discard the other. When a monster is destroyed by battle involving your Fiend monster, while this card is in your GY: You can add this card to your hand. You can only use each effect of "Zalamander Catalyzer" once per turn.