Is Gandalf of the Secret Fire legal in Standard, Modern, and Commander?

Gandalf of the Secret Fire is legal in: Legacy, Vintage, Commander.

Gandalf of the Secret Fire

Q: What type of card is Gandalf of the Secret Fire?

Gandalf of the Secret Fire is a Legendary Creature — Avatar Wizard. Its oracle text reads: "Whenever you cast an instant or sorcery spell from your hand during an opponent's turn, exile that card with three time counters on it instead of putting it into your graveyard as it resolves. Then if the exiled card doesn't have suspend, it gains suspend. (At the beginning of your upkeep, remove a time counter. When the last is removed, you may play it without paying its mana cost.)"

Legendary Creature — Avatar Wizard

Whenever you cast an instant or sorcery spell from your hand during an opponent's turn, exile that card with three time counters on it instead of putting it into your graveyard as it resolves. Then if the exiled card doesn't have suspend, it gains suspend. (At the beginning of your upkeep, remove a time counter. When the last is removed, you may play it without paying its mana cost.)

Set Tales of Middle-earth Commander

Rarity Mythic Rare

Mana Value 4

Artist Matt Stewart

Collector # 507

Scryfall Gatherer