Soprano of the Dark Woods

Petrify (Whenever a creature blocks or becomes blocked by this creature, put a petrify counter on that creature at end of combat. It can't attack or block for as long as it has a petrify counter on it.)
Soprano of the Dark Woods gets +1/+1 for each petrify counter among creatures your opponent's control.
Her achingly beautiful melody fills all who hear it with a paralyzing dread.