Is Aerie Bowmasters legal in Standard, Modern, and Commander?

Aerie Bowmasters is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Pauper.

What type of card is Aerie Bowmasters?

Aerie Bowmasters is a Creature — Dog Archer. Its oracle text reads: "Reach (This creature can block creatures with flying.) Megamorph {5}{G} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its megamorph cost and put a +1/+1 counter on it.) Power/Toughness: 3/4"