Megumin of the Crimson Clan

{r}{r}: Place an Explosion Counter on Megumin.
Explosion - {t}, remove all Explosion Counters
from Megumin: Deal 1 damage to target creature
for each counter removed. If at least 10 counters
were removed, deal 1 damage to target player and
all creatures he or she controls for each counters removed instead.
{1}{t}: Add {r} to your Mana Pool.