Is Diviner of Mist legal in Standard, Modern, and Commander?

Diviner of Mist is legal in: Legacy, Vintage, Commander.

Diviner of Mist

Q: What type of card is Diviner of Mist?

Diviner of Mist is a Creature — Dragon. Its oracle text reads: "Flying Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead."

Creature — Dragon

Flying

Whenever this creature attacks, mill four cards. You may cast an instant or sorcery spell from your graveyard with mana value 4 or less without paying its mana cost. If that spell would be put into your graveyard, exile it instead.

Set Tarkir: Dragonstorm Commander

Rarity Rare

Mana Value 5

Artist Lorenzo Mastroianni

Collector # 20

Scryfall Gatherer