Costume Closet is a uncommon Artifact card from Marvel Super Heroes Commander (MSC), collector number 770. Current market price: $0.22 (foil $0.34), TCGplayer market prices via Scryfall.
This artifact enters with two +1/+1 counters on it. {T}: Move a +1/+1 counter from this artifact onto target creature you control. Activate only as a sorcery. Whenever a modified creature you control leaves the battlefield, put a +1/+1 counter on this artifact. (Equipment, Auras you control, and counters are modifications.)