Is Alley Assailant legal in Standard, Modern, and Commander?

Alley Assailant is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Pauper, Historic.

What type of card is Alley Assailant?

Alley Assailant is a Creature — Vampire Rogue. Its oracle text reads: "This creature enters tapped. Disguise {4}{B}{B} (You may cast this card face down for {3} as a 2/2 creature with ward {2}. Turn it face up any time for its disguise cost.) When this creature is turned face up, target opponent loses 3 life and you gain 3 life."