Discover the Impossible is a uncommon Instant card from Kamigawa: Neon Dynasty (NEO), collector number 50. Current market price: $0.22 (foil $0.22), TCGplayer market prices via Scryfall.
Look at the top five cards of your library. Exile one of them face down and put the rest on the bottom of your library in a random order. You may cast the exiled card without paying its mana cost if it's an instant spell with mana value 2 or less. If you don't, put that card into your hand.