Is Timeless Dragon legal in Standard, Modern, and Commander?

Timeless Dragon is legal in: Modern, Legacy, Vintage, Commander, Historic.

What type of card is Timeless Dragon?

Timeless Dragon is a Creature — Dragon. Its oracle text reads: "Flying Plainscycling {2} ({2}, Discard this card: Search your library for a Plains card, reveal it, put it into your hand, then shuffle.) Eternalize {2}{W}{W} ({2}{W}{W}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Dragon with no mana cost. Eternalize only as a sorcery.)"

Timeless Dragon

Creature — Dragon

Flying

Plainscycling (, Discard this card: Search your library for a Plains card, reveal it, put it into your hand, then shuffle.)

Eternalize (, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie Dragon with no mana cost. Eternalize only as a sorcery.)

Set Modern Horizons 2

Rarity Rare

Mana Value 5

Artist Anastasia Ovchinnikova

Collector # 35

Scryfall Gatherer