Veteran Gunslinger

Reload 5—{5}{w} (This enters the battlefield
with five shot counters on it. {5}{w}: If this has
fewer than five shot counters on it, put a number
of shot counters on it equal to the difference.)
Remove X shot counters from Veteran Gunslinger: Exile target creature blocking
or being blocked by it with mana value X or less. X can't be 0.