Pestem Tenebris

Deathtouch
{b/g}{b/g}{b/g}:Target creature gets a -1/-1 counter.
Whenever a creature dies that had a -1/-1 counter create a black 1/1 Plague Spore creature token with Flying/Deathtouch and "This creature cannot have -1/-1 counters placed on it"
When there are 5 or more plague spore creature tokens on the battlefield transform Pestem Tenebris