Is Enigma Sphinx legal in Standard, Modern, and Commander?

Enigma Sphinx is legal in: Modern, Legacy, Vintage, Commander.

Enigma Sphinx

Q: What type of card is Enigma Sphinx?

Enigma Sphinx is an Artifact Creature — Sphinx. Its oracle text reads: "Flying When this creature is put into your graveyard from the battlefield, put it into your library third from the top. Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)"

Artifact Creature — Sphinx

Flying

When this creature is put into your graveyard from the battlefield, put it into your library third from the top.

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)

Set Commander 2018

Rarity Rare

Mana Value 7

Artist Chris Rahn

Collector # 178

Scryfall Gatherer