The Prismatic Piper 
Legendary Creature — Shapeshifter
If The Prismatic Piper is your commander, choose a color before the game begins. The Prismatic Piper is the chosen color. Partner (You can have two commanders if both have partner.)
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL