Voidmage Prodigy (ONS) from Onslaught, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Scott M. Fischer
• Card Text:
  UU, Sacrifice a Wizard: Counter target spell.
  Morph U (You may play this face down as a 2/2 creature for 3. Turn it face up any time for its morph cost.)