Moonlight Bargain is a rare Instant card from Ravnica: City of Guilds (RAV), collector number 95. Current market price: $0.40 (foil $2.58), TCGplayer market prices via Scryfall.
Look at the top five cards of your library. For each card, put that card into your graveyard unless you pay 2 life. Then put the rest into your hand.