The Mimeoplasm is a mythic Legendary Creature — Ooze card from Commander Anthology Volume II (CM2), collector number 1. Current market price: — (foil $0.62), TCGplayer market prices via Scryfall.
As The Mimeoplasm enters, you may exile two creature cards from graveyards. If you do, it enters as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card.