Garruk's Horde is a rare Creature — Beast card from Welcome Deck 2017 (W17), collector number 24. Current market price: $0.30, TCGplayer market prices via Scryfall.
Trample Play with the top card of your library revealed. You may cast creature spells from the top of your library. (Do this only any time you could cast that creature spell. You still pay the spell's costs.)