Fortune's Favor is a uncommon Instant card from Eldritch Moon (EMN), collector number 61. Current market price: $0.25 (foil $0.21), TCGplayer market prices via Scryfall.
Target opponent looks at the top four cards of your library and separates them into a face-down pile and a face-up pile. Put one pile into your hand and the other into your graveyard.