Chameleon, Master of Disguise is a uncommon Legendary Creature — Human Shapeshifter Villain card from Marvel Super Heroes Commander (MSC), collector number 148. Current market price: $0.42 (foil $1.81), TCGplayer market prices via Scryfall.
You may have Chameleon enter as a copy of a creature you control, except his name is Chameleon, Master of Disguise. Mayhem {2}{U} (You may cast this card from your graveyard for {2}{U} if you discarded it this turn. Timing rules still apply.)