Emberstone Surge

Emberstone Surge deals X damage to each
opponent and each creature and planeswalker
they control. Where X is the number of colors
of mana spent to cast this spell.
Flashback {4}{r} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
"The Emberstone blazed with the flames of defiance, kindling the spirit of rebellion in the hearts of all who
dared stand against Seren's rule."