Is Split Decision legal in Standard, Modern, and Commander?

Split Decision is legal in: Legacy, Vintage, Commander.

Split Decision

Q: What type of card is Split Decision?

Split Decision is an Instant. Its oracle text reads: "Will of the council — Choose target instant or sorcery spell. Starting with you, each player votes for denial or duplication. If denial gets more votes, counter the spell. If duplication gets more votes or the vote is tied, copy the spell. You may choose new targets for the copy."

Instant

Will of the council — Choose target instant or sorcery spell. Starting with you, each player votes for denial or duplication. If denial gets more votes, counter the spell. If duplication gets more votes or the vote is tied, copy the spell. You may choose new targets for the copy.

Set Conspiracy

Rarity Uncommon

Mana Value 2

Artist Robbie Trevino

Collector # 25

Scryfall Gatherer