Cheapest priced copy (Foundations): $0.35 at Card Kingdom, near mint, their price list as of .
Goldvein Pick 
Artifact — Equipment · Common · Foundations · #253
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.)
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
4 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations | 253 | Common | $0.35 | $0.49 |
| Jumpstart 2022 | 769 | Common | $0.35 | — |
| Kaldheim | 239 | Common | $0.35 | $0.49 |
| The List | KHM-239 | Common | $0.35 | — |