Thief's Knife is a uncommon Artifact — Equipment card from Final Fantasy (FIN), collector number 81. Current market price: $0.20 (foil $0.64), TCGplayer market prices via Scryfall.
Job select (When this Equipment enters, create a 1/1 colorless Hero creature token, then attach this to it.) Equipped creature gets +1/+1, has "Whenever this creature deals combat damage to a player, draw a card," and is a Rogue in addition to its other types. Equip {4}