Dack's Duplicate is a rare Creature — Shapeshifter card from Double Masters 2022 (2X2), collector number 198. Current market price: $0.36 (foil $0.43), TCGplayer market prices via Scryfall.
You may have this creature enter as a copy of any creature on the battlefield, except it has haste and dethrone. (Whenever it attacks the player with the most life or tied for most life, put a +1/+1 counter on it.)