Nurgle, God of Decay

This spell costs {1} less to cast for each counter
on creatures you control.
Indestructible, wither
Nurgle isn't a creature as long as there hasn't
been put a counter on a creature this turn.
Creatures you control have toxic 1 and "{t}, Put
a -1/-1 counter on this creature: Put two -1/-1 counters on another target creature.