Is Haldan, Avid Arcanist legal in Standard, Modern, and Commander?

Haldan, Avid Arcanist is legal in: Legacy, Vintage, Commander.

Haldan, Avid Arcanist

Q: What type of card is Haldan, Avid Arcanist?

Haldan, Avid Arcanist is a Legendary Creature — Human Wizard. Its oracle text reads: "Partner with Pako, Arcane Retriever (When this creature enters, target player may put Pako into their hand from their library, then shuffle.) You may play lands and cast noncreature spells from among cards you exiled that have fetch counters on them, and you may spend mana as though it were mana of any color to cast those spells."

Legendary Creature — Human Wizard

Partner with Pako, Arcane Retriever (When this creature enters, target player may put Pako into their hand from their library, then shuffle.)

You may play lands and cast noncreature spells from among cards you exiled that have fetch counters on them, and you may spend mana as though it were mana of any color to cast those spells.

Set Commander 2020

Rarity Mythic Rare

Mana Value 3

Artist Manuel Castañón

Collector # 2

Scryfall Gatherer