Buzzbark's Sniper

Whenever a player is dealt 3 or more damage by asingle source, you may cast Buzzbark's Sniper
this turn as though it had flash.
When Buzzbark's Sniper enters the battlefield,
roll a six sided die. If that die touches Buzzbark's
Sniper, put a number of +1/+1 counters on it
equal to the result. Otherwise it deals that
damage to any target equal to the result.
"Target locked!"