Is Drownyard Behemoth legal in Standard, Modern, and Commander?

Drownyard Behemoth is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Drownyard Behemoth?

Drownyard Behemoth is a Creature — Eldrazi Crab. Its oracle text reads: "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."