Is Mistway Spy legal in Standard, Modern, and Commander?

Mistway Spy is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Mistway Spy?

Mistway Spy is a Creature — Merfolk Detective. Its oracle text reads: "Flying Disguise {1}{U} (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, until end of turn, whenever a creature you control deals combat damage to a player, investigate."