Pestilence Incarnate

Flying Deathtouch
{b/g}{b/g}{b/g}{b/g}: Each other creature gets a -1/-1 counter
Every time a creature dies that had a -1/-1 counter on it create a black/green 1/1 Plague Spore creature token with Fying/Deathtouch and has "This creature cannot have -1/-1 counters placed on it."