Is Possessed Centaur legal in Standard, Modern, and Commander?

Possessed Centaur is legal in: Legacy, Vintage, Commander.

Possessed Centaur

Q: What type of card is Possessed Centaur?

Possessed Centaur is a Creature — Centaur Horror. Its oracle text reads: "Trample Threshold — As long as seven or more cards are in your graveyard, this creature gets +1/+1, is black, and has "{2}{B}, {T}: Destroy target green creature." Power/Toughness: 3/3"