Orcish Mine is a uncommon Enchantment — Aura card from Homelands (HML), collector number 78. Current market price: $0.20, TCGplayer market prices via Scryfall.
Enchant land This Aura enters with three ore counters on it. At the beginning of your upkeep and whenever enchanted land becomes tapped, remove an ore counter from this Aura. When the last ore counter is removed from this Aura, destroy enchanted land and this Aura deals 2 damage to that land's controller.