Temporal Firestorm [Dominaria United Prerelease Promos]

Cost: 3 R R Kicker 1 W and/or 1 U (You may pay an additional 1 W and/or 1 U as you cast this spell.)
Choose up to X creatures and/or planeswalkers you control, where X is the number of times this spell was kicked. Those permanents phase out.
Temporal Firestorm deals 5 damage to each creature and each planeswalker.