Redcap Thief is a common Creature — Goblin Rogue card from Wilds of Eldraine (WOE), collector number 147. Current market price: $0.18 (foil $0.29), TCGplayer market prices via Scryfall.
When this creature enters, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.")