Planar Genesis is a uncommon Instant card from Modern Horizons 3 (MH3), collector number 198. Current market price: $0.38 (foil $1.87), TCGplayer market prices via Scryfall.
Look at the top four cards of your library. You may put a land card from among them onto the battlefield tapped. If you don't, put a card from among them into your hand. Put the rest on the bottom of your library in a random order.