Guild Thief is a uncommon Creature — Orc Rogue card from Adventures in the Forgotten Realms (AFR), collector number 61. Current market price: $0.16 (foil $0.06), TCGplayer market prices via Scryfall.
Whenever this creature deals combat damage to a player, put a +1/+1 counter on it. Cunning Action — {3}{U}: This creature can't be blocked this turn.