Grillik, the Toxic

Deathtouch, vigilance
Creatures you control have wither. Whenever
a creature with a -1/-1 counter dies, put a -1/-1
counter on target creature its owner controls.
{b/g}{t}: Put a -1/-1 counter on target creature.
At the beginning of your end step, gain 1 life
for each -1/-1 counter on creatures.