X (UST) from Unstable, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Dmitry Burmak
• Card Text:
  As long as X is in X's owner's opponent's hand, X's owner may cast X and activate X's abilities. That opponent can't cast X and plays with his or her hand revealed.
  UB, T: Put X into target opponent's hand.
  3UB: You may play a card in the same hand as X without paying its mana cost.