Comet Storm (C17) from Commander 2017, available at 401 Games Canada.

• Rarity: Mythic Rare
• Finish: Normal
• Artist: Jung Park
• 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 deals X damage to each of them.