Is Ethereal Elk legal in Standard, Modern, and Commander?

Ethereal Elk is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

Ethereal Elk

Q: What type of card is Ethereal Elk?

Ethereal Elk is a Creature — Elk Spirit. Its oracle text reads: "Trample When this creature enters, you may search your library and/or graveyard for a card named Vivien, Nature's Avenger, reveal it, and put it into your hand. If you search your library this way, shuffle."

Creature — Elk Spirit

Trample

When this creature enters, you may search your library and/or graveyard for a card named Vivien, Nature's Avenger, reveal it, and put it into your hand. If you search your library this way, shuffle.

Set Core Set 2020

Rarity Rare

Mana Value 5

Artist Jason Felix

Collector # 299

Scryfall Gatherer