Is Sootfeather Flock legal in Standard, Modern, and Commander?

Sootfeather Flock is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Sootfeather Flock?

Sootfeather Flock is a Creature — Bird. Its oracle text reads: "Flying Morph {3}{B} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) *They pick at the remains of the city's corpse.* Power/Toughness: 3/2"