Is Temur Charger legal in Standard, Modern, and Commander?

Temur Charger is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Temur Charger?

Temur Charger is a Creature — Horse. Its oracle text reads: "Morph—Reveal a green card in your hand. (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 gains trample until end of turn."