Goran, slumbering rot

Trample, forestwalk, swampwalk, convoke, deathtouch.
This creature has as many +1/+1 counters as
there are creatures in all graveyards and exile.
{b/g}: sacrifice target creature.
{b}{g}: destroy target creature.
{2}{b}{g}{p/b}{p/g}: return this creature from your
graveyard or exile to the battlefield tapped