Mairsil and Urabrask the Hidden on the battlefield.
All other permanents in exile.
Mairsil does not have a -1/-1 counter on it.
Steps
Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
Activate Mairsil using Blood Vassal's ability by sacrificing it, adding ({B} magic symbol) ({B} magic symbol) .
When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
Activate Mairsil using Carnifex Demon's ability by paying ({B} magic symbol) and removing a -1/-1 counter from it, putting a -1/-1 counter on each other creature.