Black Rock Shooter

Undying, Renew (This creature regenerates at the
end of combat instead of the end of the turn.)
{x}{r}{u}: Place X amount of Rock counters on
Black Rock Shooter. This ability can only be
activated if there are no Rock counters on Black
Rock Shooter.
{t}: Remove any number of Rock counters from
Black Rock Shooter. It deals damage to any target
equal to the amount of Rock counters removed
this way.