Dimir Keyrune (GTC) from Gatecrash, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Daniel Ljunggren
• Card Text:
  T: Add U or B to your mana pool.
  UB: Dimir Keyrune becomes a 2/2 blue and black Horror artifact until end of turn and is unblockable this turn.