Worldwake spoiler - Comet Storm

Card Name: Comet Storm

Mana Cost: XRR

Converted Mana Cost: 2

Types: Instant

Card Text:
Multikicker 1 (You may pay an additional 1 any number of times as you cast this spell.)Choose target creature or player, then choose another target creature or player for each time Comet Storm was kicked. Comet Storm does X damage to each of them

Expansion: Worldwake (Mythic Rare)