Mox Emerald (CEI) from Intl. Collectors’ Edition, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Dan Frazier
• Card Text:
  (This card has square corners and a gold bordered back. Not tournament legal.)
  Add 1 green mana to your mana pool. Tapping this artifact can be played as an interrupt.