Legion's Firestorm

Boros Firestorm deal X damage to all creatures,
where X are 1 .
If no one creature die , then put X +1/+1 counter
on all creature you control and regenerate them.
Repeat this spell with X are the ancient value
of X +1 until a creature die .
"Our army is ready for any sacrifice.
You can knock down comets."
--Tajic, to Aurelia--