Is Discontinuity legal in Standard, Modern, and Commander?

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

Discontinuity

Q: What type of card is Discontinuity?

Discontinuity is an Instant. Its oracle text reads: "During your turn, this spell costs {2}{U}{U} less to cast. End the turn. (Exile all spells and abilities from the stack, including this card. The player whose turn it is discards down to their maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)"

Instant

During your turn, this spell costs less to cast.

End the turn. (Exile all spells and abilities from the stack, including this card. The player whose turn it is discards down to their maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)

Set Core Set 2021

Rarity Mythic Rare

Mana Value 6

Artist Volkan Baǵa

Collector # 48

Scryfall Gatherer