Twig, Traveling Saleswomen

Whenever this creature enters the battlefield put a +1/+1 counter on a creature you control and a
-1/-1 counter on a creature an opponent controls.

Bad Medicine - Whenever a creature with a -1/-1 counter on it dies you may pay {2} adding an equal amount of +1/+1 counters on target creature.

Good Poison - Whenever a creature with a +1/+1 counter on it dies you may pay {2} adding an equal amount of -1/-1 counters on a target creature.