Selesnya Keyrune (RTR) from Return to Ravnica, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Daniel Ljunggren
• Card Text:
  T: Add G or W to your mana pool.
  GW: Selesnya Keyrune becomes a 3/3 green and white Wolf artifact creature until end of turn.