Coveted Jewel (MSC) from Marvel Super Heroes Commander, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Eric Wilkerson
• Card Text:
  When this artifact enters, draw three cards.
  T: Add three mana of any one color.
  Whenever one or more creatures an opponent controls attack you and aren't blocked, that player draws three cards and gains control of this artifact. Untap it.