Is Crimson Honor Guard legal in Standard, Modern, and Commander?

Crimson Honor Guard is legal in: Legacy, Vintage, Commander.

Crimson Honor Guard

Q: What type of card is Crimson Honor Guard?

Crimson Honor Guard is a Creature — Vampire Knight. Its oracle text reads: "Trample At the beginning of each player's end step, this creature deals 4 damage to that player unless they control a commander. *The finest soldiers aren't worth a whit without a set of hands to lead them and a set of eyes to guide them.* Power/Toughness: 4/5"