Armillus Dynat, Harrowmaster

Armillus Dynat, Harrowmaster enters the
battlefield with three +1/+1 counters on it.
Whenever another creature you control dies,
if it had a +1/+1 counter on it, put a +1/+1
counter on Armillus Dynat.
When Armillus Dynat dies, create an X/X black
and green Hydra creature token, where X is
the number of +1/+1 counters on Armillus
Dynat.