Sultai Soothsayer is a uncommon Creature — Snake Shaman card from Khans of Tarkir (KTK), collector number 205. Current market price: $0.11 (foil $0.46), TCGplayer market prices via Scryfall.
When this creature enters, look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard.