Blood Collector

{t}: Put a -1/-1 counter on another creature you control. Put a +1/+1 counter on Blood Collector.
At the beginning of your endstep, if a creature
dealt damage by Blood Collector this turn died
this turn, put a +1/+1 counter on Blood
Collector.
{b}{r}: Move any number of +1/+1 counters from
Blood Collector to another creature.