Is Knight of the Ebon Legion legal in Standard, Modern, and Commander?

Knight of the Ebon Legion is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Knight of the Ebon Legion

Q: What type of card is Knight of the Ebon Legion?

Knight of the Ebon Legion is a Creature — Vampire Knight. Its oracle text reads: "{2}{B}: This creature gets +3/+3 and gains deathtouch until end of turn. At the beginning of your end step, if a player lost 4 or more life this turn, put a +1/+1 counter on this creature. (Damage causes loss of life.) Power/Toughness: 1/2"