Is Mass of Mysteries legal in Standard, Modern, and Commander?

Mass of Mysteries is legal in: Legacy, Vintage, Commander.

Mass of Mysteries

Q: What type of card is Mass of Mysteries?

Mass of Mysteries is a Legendary Creature — Elemental. Its oracle text reads: "First strike, vigilance, trample At the beginning of combat on your turn, another target Elemental you control gains myriad until end of turn. (Whenever it attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)"

Legendary Creature — Elemental

First strike, vigilance, trample

At the beginning of combat on your turn, another target Elemental you control gains myriad until end of turn. (Whenever it attacks, for each opponent other than defending player, you may create a token copy that's tapped and attacking that player or a planeswalker they control. Exile the tokens at end of combat.)

Set Lorwyn Eclipsed Commander

Rarity Mythic Rare

Mana Value 5

Artist Jeff Miracola

Collector # 3

Scryfall