Iron Fist, Living Weapon is a uncommon Legendary Creature — Human Warrior Hero card from Marvel Super Heroes (MSH), collector number 138. Current market price: $0.18 (foil $0.32), TCGplayer market prices via Scryfall.
Whenever you cast a spell that targets a creature you control, Iron Fist gains "{T}: Iron Fist deals damage equal to his power to any other target" until end of turn.