Is Breathkeeper Seraph legal in Standard, Modern, and Commander?

Breathkeeper Seraph is legal in: Legacy, Vintage, Commander.

Breathkeeper Seraph

Q: What type of card is Breathkeeper Seraph?

Breathkeeper Seraph is a Creature — Angel. Its oracle text reads: "Flying, 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 Breathkeeper Seraph is paired with another creature, each of those creatures has "When this creature dies, you may return it to the battlefield under its owner's control at the beginning of your next upkeep.""

Creature — Angel

Flying, 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 Breathkeeper Seraph is paired with another creature, each of those creatures has "When this creature dies, you may return it to the battlefield under its owner's control at the beginning of your next upkeep."

Set Crimson Vow Commander

Rarity Rare

Mana Value 6

Artist Alexander Mokhov

Collector # 31

Scryfall Gatherer