Is Lurrus of the Dream-Den legal in Standard, Modern, and Commander?

Lurrus of the Dream-Den is legal in: Vintage, Commander, Historic. It is banned in: Modern, Pioneer, Legacy.

Lurrus of the Dream-Den

Q: What type of card is Lurrus of the Dream-Den?

Lurrus of the Dream-Den is a Legendary Creature — Cat Nightmare. Its oracle text reads: "Companion — Each permanent card in your starting deck has mana value 2 or less. (If this card is your chosen companion, you may put it into your hand from outside the game for {3} as a sorcery.) Lifelink Once during each of your turns, you may cast a permanent spell with mana value 2 or less from your graveyard. Power/Toughness: 3/2"

Legendary Creature — Cat Nightmare

Companion — Each permanent card in your starting deck has mana value 2 or less. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)