Dave, He Has a Gun Watch Out

Dave enters the battlefield with 7 bullet counters
on him.
Reload {1}{b}{r}(Remove all bullet counters from
Dave, then put 7 bullet counters on Dave.)
Whenever a creature attacks you, you may remove
any number of bullet counters from Dave, if you
do, destroy that many attacking creatures.
"Idiots, I have a gun."
—Dave, Has a Gun