Moradath, Bringer of Decay

Moradath costs {1} less for each creature with a
-1/-1 counter on it.
If a spell or ability would put one or more +1/+1 counters on a creature an opponent controls, put
a -1/-1 counter on it instead.
{b/g}{b/r}: remove a -1/-1 counter from target creature and put it onto another target creature.
{x}{b}{r}{g}: choose one -
Put X -1/-1 counters on target creature.
Put a -1/-1 counter on up to X target creatures.