Oracle Text

Sorcery

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.