Sphinx of Forgotten Lore

Creature — Sphinx{2}{U}{U}3/3

Flash (You may cast this spell any time you could cast an instant.) Flying Whenever this creature attacks, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to that card's mana cost. (You may cast that card from your graveyard for its flashback cost. Then exile it.)

Colour identity Blue · Flying, Flash

In short

Sphinx of Forgotten Lore has 5 listed printings; the most valuable is the Borderless · Mana Foil printing from FDN at US$17.40 on TCGplayer's market price. Prices below are the cheapest in-stock listing in the United States.