Fiver, Charge Blade Hunter

Fiver, Charge Blade Hunter enters the battlefield
with X +1/+1 counters on it, where X is the
number of Hunters you control.
Whenever Fiver, Charge Blade Hunter attacks,
put a charge counter on Fiver, Charge Blade Hunter
{t}, remove 3 charge counters from Fiver, Charge Blade Hunter:
Deal 5 damage to target creature or player