Ahzari, Lady of Despair

Deathtouch, Afflict 3
Put up to three Agony counters on three separate creatures your opponent controls.
{t}{b}{b} Tap two target creatures your opponent controls, if a creature has an Agony counter, it's controller loses 2 life.
If both creatures are not mono-black, tap a third.
"Anguish is a melody, each scream a note in my chorus."