Sevinne, the Chronoclasm

If you cast an instant or sorcery spell from your graveyard before Sevinne enters the battlefield during the same turn, its last ability can't trigger that turn.

If the spell that's copied has an X whose value was determined as it was cast, the copy has the same value of X.

The copy will have the same targets as the spell it's copying unless you choose new ones. You may change any number of the targets, including all of them or none of them. The new targets must be legal.

A copy is created even if the spell that caused Sevinne's ability to trigger has been countered by the time that ability resolves. The copy resolves before the original spell.