Tracker's Instincts is a uncommon Sorcery card from Dark Ascension (DKA), collector number 128. Current market price: $0.20 (foil $0.77), TCGplayer market prices via Scryfall.
Reveal the top four cards of your library. Put a creature card from among them into your hand and the rest into your graveyard. Flashback {2}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)