Ulohan, Primal Vortex

Indestructible, Flying, Haste
Ulohan enters the battlefield with X +1/+1 on it.
At the beginning of your upkeep, create Y 0/1 Colourless elemental creature tokens,where Y is
Ulohan's power
Sacrifice an elemental; the next colourless instant
or sorcery spell you cast this turn gains storm as it resolves
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A force older than time, and as unreadable as the void
from whence it came.