Chromeshell Crab (CMD) from Commander 2011, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Ron Spencer
• Card Text:
  Morph 4U (You may cast this face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)
  When Chromeshell Crab is turned face up, you may exchange control of target creature you control and target creature an opponent controls.