Is King of the Oathbreakers legal in Standard, Modern, and Commander?

King of the Oathbreakers is legal in: Modern, Legacy, Vintage, Commander, Historic.

King of the Oathbreakers

Q: What type of card is King of the Oathbreakers?

King of the Oathbreakers is a Legendary Creature — Spirit Noble. Its oracle text reads: "Flying Whenever King of the Oathbreakers or another Spirit you control becomes the target of a spell, it phases out. (Treat it and anything attached to it as though they don't exist until your next turn.) Whenever King of the Oathbreakers or another Spirit you control phases in, create a tapped 1/1 white Spirit creature token with flying. Power/Toughness: 3/3"

Legendary Creature — Spirit Noble

Flying

Whenever King of the Oathbreakers or another Spirit you control becomes the target of a spell, it phases out. (Treat it and anything attached to it as though they don't exist until your next turn.)

Whenever King of the Oathbreakers or another Spirit you control phases in, create a tapped 1/1 white Spirit creature token with flying.

Power/Toughness: 3/3

Set The Lord of the Rings: Tales of Middle-earth

Rarity Rare

Mana Value 4

Artist Tatiana Veryayskaya

Collector # 211

Scryfall