Droxis, the spirit generator

Shadow, deathtouch, menace
whenever another creature would die
Droxis creates three white and black 1/1 spirits
with shadow.
Sacrifice two 1/1 spirits put a +1/+1 counter on
each creature you control
{1}{w}{b}{t}remove a +1/+1 counter from a
creature you control, put a -1/-1 counter on
target creature.