Is Brine Elemental legal in Standard, Modern, and Commander?

Brine Elemental is legal in: Modern, Legacy, Vintage, Commander.

Brine Elemental

Q: What type of card is Brine Elemental?

Brine Elemental is a Creature — Elemental. Its oracle text reads: "Morph {5}{U}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When this creature is turned face up, each opponent skips their next untap step. *Water calls to water, and the world is left exhausted and withered in its wake.* Power/Toughness: 5/4"