Hikigaeru, Wrath of Boseju

Whenever a permanent leaves the battlefield, put
a death counter on Hikigaeru.
Counters are not removed from Hikigaeru as it
moves between zones.(graveyard, battlefield,
command zone, etc.)
When Hikigaeru deals damage to an opponent,
that opponent loses life equal to the number of
death counters on Hikigaeru.