Is Woodcloaker legal in Standard, Modern, and Commander?

Woodcloaker is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Woodcloaker?

Woodcloaker is a Creature — Elf. Its oracle text reads: "Morph {2}{G}{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.) When this creature is turned face up, target creature gains trample until end of turn."