The Prismatic Piper is a special Legendary Creature — Shapeshifter card from Commander Masters (CMM), collector number 1. Current market price: $0.20, TCGplayer market prices via Scryfall.
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.)