Is Greenbelt Radical legal in Standard, Modern, and Commander?

Greenbelt Radical is legal in: Standard, Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Greenbelt Radical?

Greenbelt Radical is a Creature — Centaur Citizen. Its oracle text reads: "Disguise {5}{G}{G} (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, put a +1/+1 counter on each creature you control. Creatures you control gain trample until end of turn."