Daring Discovery is a common Sorcery card from The Lost Caverns of Ixalan (LCI), collector number 142. Current market price: $0.25 (foil $0.30), TCGplayer market prices via Scryfall.
Up to three target creatures can't block this turn. Discover 4. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)