Nurgle, Plague Lord

Indestructible, trample
Nurgle is not a creature until 2 creatures are be killed by -1/-1 counters the same turn
Nurgles power and toughness are unaffected by -1/-1 counters
Nontoken creatures you control cannot be killed by -1/-1 counters
Creatures you control have Wither {x} equal to the number of -1/-1 counters on them
Sacrifice a creature: place a -1/-1 counter on all creatures