Flesh Duplicate is a mythic Creature — Shapeshifter Rebel card from Special Guests (SPG), collector number 161. Current market price: $9.66 (foil $23.33), TCGplayer market prices via Scryfall.
You may have this creature enter as a copy of any creature on the battlefield, except it has vanishing 3 if that creature doesn't have vanishing. (A permanent with vanishing 3 enters with three time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)