Magnanimous Magistrate + Pir, Imaginative Rascal + Pollenbright Druid + Altar of Dementia

Magnanimous Magistrate

Pir, Imaginative Rascal

Pollenbright Druid

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing Pollenbright Druid.
2. Magnanimous Magistrate triggers, causing you to remove two counters from it and return Pollenbright Druid from your graveyard to the battlefield.
3. When Pollenbright Druid enters the battlefield, proliferate, putting two reprieve counters on Magnanimous Magistrate.
4. Resolve the Altar of Dementia ability, causing any player to mill a card.
5. Repeat.