All permanents on the battlefield. You have a way to cause an opponent to lose exactly one life.
Deathbringer Thoctar exiled by Agatha's Soul Cauldron. All other permanents on the battlefield. Ob Nixilis has at least one +1/+1 counter on it.
Triskelion exiled by Agatha's Soul Cauldron. All other permanents on the battlefield. Ob Nixilis has at least one +1/+1 counter on it.
Walking Ballista exiled by Agatha's Soul Cauldron. All other permanents on the battlefield. Ob Nixilis has at least one +1/+1 counter on it.
All permanents on the battlefield.
Sensei's Divining Top in hand. All other permanents on the battlefield. available.