Worn Powerstone - USG Reprint (PLST) from The List, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Henry G. Higginbotham
• Card Text:
  Worn Powerstone comes into play tapped.
  T: Add two colorless mana to your mana pool. Play this ability as a mana source.