Identity Thief is a rare Creature — Shapeshifter card from New Capenna Commander (NCC), collector number 224. Current market price: $0.29, TCGplayer market prices via Scryfall.
Whenever this creature attacks, you may exile another target nontoken creature. If you do, this creature becomes a copy of that creature until end of turn. Return the exiled card to the battlefield under its owner's control at the beginning of the next end step.