Progenitor Mimic is a mythic Creature — Shapeshifter card from Commander 2016 (C16), collector number 216. Current market price: $1.17, TCGplayer market prices via Scryfall.
You may have this creature enter as a copy of any creature on the battlefield, except it has "At the beginning of your upkeep, if this creature isn't a token, create a token that's a copy of this creature."