Drownyard Behemoth is a uncommon Creature — Eldrazi Crab card from Eldritch Moon (EMN), collector number 4. Current market price: $0.04 (foil $0.53), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Emerge {7}{U} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature's mana value.) This creature has hexproof as long as it entered this turn.