Sudden Substitution is a rare Instant card from Commander 2019 (C19), collector number 11. Current market price: $6.73, TCGplayer market prices via Scryfall.
Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.) Exchange control of target noncreature spell and target creature. Then the spell's controller may choose new targets for it.