Careening Mine Cart is a uncommon Artifact — Vehicle card from The Lost Caverns of Ixalan (LCI), collector number 247. Current market price: $0.34 (foil $0.36), TCGplayer market prices via Scryfall.
Whenever this Vehicle attacks, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.") Crew 1 (Tap any number of creatures you control with total power 1 or more: This Vehicle becomes an artifact creature until end of turn.)