Chameleon Spirit 
Creature — Illusion Spirit
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.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL