Is Exsanguinator Cavalry legal in Standard, Modern, and Commander?

Exsanguinator Cavalry is legal in: Legacy, Vintage, Commander.

Exsanguinator Cavalry

Q: What type of card is Exsanguinator Cavalry?

Exsanguinator Cavalry is a Creature — Vampire Knight. Its oracle text reads: "Menace, lifelink Whenever a Knight you control deals combat damage to a player, put a +1/+1 counter on that creature and create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")"

Creature — Vampire Knight

Menace, lifelink

Whenever a Knight you control deals combat damage to a player, put a +1/+1 counter on that creature and create a Blood token. (It's an artifact with ", , Discard a card, Sacrifice this token: Draw a card.")