Is Grinning Demon legal in Standard, Modern, and Commander?

Grinning Demon is legal in: Legacy, Vintage, Commander.

What type of card is Grinning Demon?

Grinning Demon is a Creature — Demon. Its oracle text reads: "At the beginning of your upkeep, you lose 2 life. Morph {2}{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.) *It's drawn to the scent of screaming.* Power/Toughness: 6/6"