Deirdre Beaubeirdre

At the beginning of your upkeep, put a -1/-1
counter on target creature you don't control.
Whenever a creature dies, put a +1/+1 counter
on Deirdre Beaubeirdre.
{3}{b}{b}{b}, {t}: Destroy target creature. If that
creature dies this way, exile it and put a loyalty
counter on each planeswalker you control.