Skithilix, Weaver of Woes

Skithilix, Weaver of Woes has Deathtouch and
Lifesap
(If this creature would deal damage
to another creature, instead put -1/-1 counters
equal to this creature's power on that creature
and put a +1/+1 counter on this creature.)
{4}, {t}: Afflict X, where X equals the number of creatures in your graveyard that had a -1/-1
counter on it.