Sleetsquall

You may cast Sleetsquall as though it had flash by
sacrificing a creature with flying.
Sleetsquall deals X damage to each creature with
flying and each player. Then, for each creature
with flying that died this turn, Sleetsquall deals 1
damage to each creature without flying.
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Fast firmament-fallen frozen feather fragments frayed
fabric, foresight and fools fiercely.