Is Skirk Volcanist legal in Standard, Modern, and Commander?

Skirk Volcanist is legal in: Legacy, Vintage, Commander.

What type of card is Skirk Volcanist?

Skirk Volcanist is a Creature — Goblin. Its oracle text reads: "Morph—Sacrifice two Mountains. (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, it deals 3 damage divided as you choose among one, two, or three target creatures."