Keyword: Multikicker

Multikicker (You may pay an additional any number of times as you cast this spell.)
Choose any target, then choose another target for each time this spell was kicked. Comet Storm deals X damage to each of them.

Multikicker (You may pay an additional any number of times as you cast this spell.)
Flying
Apex Hawks enters the battlefield with a +1/+1 counter on it for each time it was kicked.

Multikicker (You may pay an additional any number of times as you cast this spell.)
Islandwalk (This creature can’t be blocked as long as defending player controls an Island.)
Enclave Elite enters the battlefield with a +1/+1 counter on it for each time it was kicked.

Multikicker (You may pay an additional any number of times as you cast this spell.)
Everflowing Chalice enters the battlefield with a charge counter on it for each time it was kicked.
: Add for each charge counter on Everflowing Chalice.

Multikicker (You may pay an additional any number of times as you cast this spell.)
When Bloodhusk Ritualist enters the battlefield, target opponent discards a card for each time it was kicked.

Multikicker (You may pay an additional any number of times as you cast this spell.)
Flying
When Lightkeeper of Emeria enters the battlefield, you gain 2 life for each time it was kicked.

Multikicker (You may pay an additional any number of times as you cast this spell.)
When Deathforge Shaman enters the battlefield, it deals damage to target player or planeswalker equal to twice the number of times it was kicked.