Ancient Stirrings is a rare Sorcery card from Secret Lair Promo (SLP), collector number 50. Current market price: $0.78 (foil $15.07), TCGplayer market prices via Scryfall.
Look at the top five cards of your library. You may reveal a colorless card from among them and put it into your hand. Then put the rest on the bottom of your library in any order.