Is Frontline Strategist legal in Standard, Modern, and Commander?

Frontline Strategist is legal in: Legacy, Vintage, Commander, Pauper.

What type of card is Frontline Strategist?

Frontline Strategist is a Creature — Human Soldier. Its oracle text reads: "Morph {W} (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, prevent all combat damage non-Soldier creatures would deal this turn."