Voidmage Prodigy is a special Creature — Human Wizard card from Time Spiral Timeshifted (TSB), collector number 34. Current market price: $1.77 (foil $8.28), TCGplayer market prices via Scryfall.
{U}{U}, Sacrifice a Wizard: Counter target spell. Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)