Is Towering Baloth legal in Standard, Modern, and Commander?

Towering Baloth is legal in: Legacy, Vintage, Commander.

What type of card is Towering Baloth?

Towering Baloth is a Creature — Beast. Its oracle text reads: "Morph {6}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) *The Mirari twisted all that lived in the Krosan Forest into gross mockeries of their former selves.* Power/Toughness: 7/6"