Skyclave Plunder is a uncommon Sorcery card from Zendikar Rising (ZNR), collector number 81. Current market price: $0.20 (foil $0.18), TCGplayer market prices via Scryfall.
Look at the top X cards of your library, where X is three plus the number of creatures in your party. Put three of those cards into your hand and the rest on the bottom of your library in a random order. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)