Is Pako, Arcane Retriever legal in Standard, Modern, and Commander?

Pako, Arcane Retriever is legal in: Legacy, Vintage, Commander.

Pako, Arcane Retriever

Q: What type of card is Pako, Arcane Retriever?

Pako, Arcane Retriever is a Legendary Creature — Elemental Dog. Its oracle text reads: "Partner with Haldan, Avid Arcanist Haste Whenever Pako attacks, exile the top card of each player's library and put a fetch counter on each of them. Put a +1/+1 counter on Pako for each noncreature card exiled this way."

Legendary Creature — Elemental Dog

Partner with Haldan, Avid Arcanist

Haste

Whenever Pako attacks, exile the top card of each player's library and put a fetch counter on each of them. Put a +1/+1 counter on Pako for each noncreature card exiled this way.

Set Commander 2020

Rarity Mythic Rare

Mana Value 5

Artist Manuel Castañón

Collector # 13

Scryfall Gatherer