Is Silent Specter legal in Standard, Modern, and Commander?

Silent Specter is legal in: Legacy, Vintage, Commander.

What type of card is Silent Specter?

Silent Specter is a Creature — Specter. Its oracle text reads: "Flying Whenever this creature deals combat damage to a player, that player discards two cards. Morph {3}{B}{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.) Power/Toughness: 4/4"