Gurmag Drowner is a common Creature — Snake Wizard card from Dragons of Tarkir (DTK), collector number 57. Current market price: $0.08 (foil $0.25), TCGplayer market prices via Scryfall.
Exploit (When this creature enters, you may sacrifice a creature.) When this creature exploits a creature, look at the top four cards of your library. Put one of them into your hand and the rest into your graveyard.