Temur Charger (KTK) from Khans of Tarkir, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Mark Zug
• Card Text:
  Morph—Reveal a green card in your hand. (You may cast this card face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)
  When Temur Charger is turned face up, target creature gains trample until end of turn.