Bala Ged Thief is a rare Creature — Human Rogue Ally card from Zendikar (ZEN), collector number 79. Current market price: $0.54 (foil $1.25), TCGplayer market prices via Scryfall.
Whenever this creature or another Ally you control enters, target player reveals a number of cards from their hand equal to the number of Allies you control. You choose one of them. That player discards that card.