Is Impending Flux legal in Standard, Modern, and Commander?

Impending Flux is legal in: Legacy, Vintage, Commander.

Impending Flux

Q: What type of card is Impending Flux?

Impending Flux is a Sorcery. Its oracle text reads: "Paradox — Impending Flux deals X damage to each opponent and each creature they control, where X is 1 plus the number of spells you've cast from anywhere other than your hand this turn. Foretell {1}{R}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)"

Sorcery

Paradox — Impending Flux deals X damage to each opponent and each creature they control, where X is 1 plus the number of spells you've cast from anywhere other than your hand this turn.

Foretell (During your turn, you may pay and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)