Is Imperious Mindbreaker legal in Standard, Modern, and Commander?

Imperious Mindbreaker is legal in: Legacy, Vintage, Commander.

Imperious Mindbreaker

Q: What type of card is Imperious Mindbreaker?

Imperious Mindbreaker is a Creature — Human Wizard. Its oracle text reads: "Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.) As long as Imperious Mindbreaker is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness.""

Creature — Human Wizard

Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.)

As long as Imperious Mindbreaker is paired with another creature, each of those creatures has "Whenever this creature attacks, each opponent mills cards equal to its toughness."

Set Crimson Vow Commander

Rarity Rare

Mana Value 3

Artist Olivier Bernard

Collector # 33

Scryfall Gatherer