Is Aphetto Exterminator legal in Standard, Modern, and Commander?

Aphetto Exterminator is legal in: Legacy, Vintage, Commander.

What type of card is Aphetto Exterminator?

Aphetto Exterminator is a Creature — Human Wizard. Its oracle text reads: "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.) When this creature is turned face up, target creature gets -3/-3 until end of turn."