Grexal, the Disgraced

Grexal, the Disgraced enters the battlefield with
a +1/+1 counter on it for each creature that died
this turn.
Whenever a creature dies, double the number
of +1/+1 counters on Grexal.
{t}, Remove any number of counters from
Grexal: Create that many 0/0 black
Germ creature tokens.