Thalakos Deceiver is a rare Creature — Thalakos Wizard card from Stronghold (STH), collector number 45. Current market price: $4.24, TCGplayer market prices via Scryfall.
Shadow (This creature can block or be blocked by only creatures with shadow.) Whenever this creature attacks and isn't blocked, you may sacrifice it. If you do, gain control of target creature. (This effect lasts indefinitely.)