Chameleon Spirit is a uncommon Creature — Illusion Spirit card from Mercadian Masques (MMQ), collector number 65. Current market price: $0.22 (foil $1.82), TCGplayer market prices via Scryfall.
As this creature enters, choose a color. Chameleon Spirit's power and toughness are each equal to the number of permanents of the chosen color your opponents control.