Goldvein Pick is a common Artifact — Equipment card from Foundations (FDN), collector number 253. Current market price: $0.31 (foil $0.35), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+1. Whenever equipped creature deals combat damage to a player, create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one mana of any color.") Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)