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

Skirk Marauder is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Skirk Marauder?

Skirk Marauder is a Creature — Goblin. Its oracle text reads: "Morph {2}{R} (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 2 damage to any target."