Voidmage Apprentice (LGN) from Legions, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Jim Nelson
• Card Text:
  Morph 2UU (You may play this face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)
  When Voidmage Apprentice is turned face up, counter target spell.