Activate Altar of Dementia by sacrificing Kitchen Finks.
When Kitchen Finks dies, its persist ability triggers, returning Kitchen Finks from your graveyard to the battlefield with a -1/-1 counter on it.
When Kitchen Finks enters the battlefield, it triggers, causing you to gain 3 life.
Cleric Class triggers, putting a +1/+1 counter on Kitchen Finks.
Resolve the Altar of Dementia ability.
Repeat.
This clever loop harnesses Altar of Dementia as a repeatable sacrifice outlet that mills an opponent's entire library while abusing the persist mechanic on Kitchen Finks. Normally, a -1/-1 counter would permanently neutralize Kitchen Finks after a single revival, but Cleric Class steps in to save the day by boosting your life gain and instantly canceling out that counter with a +1/+1 counter whenever you gain life. Because Kitchen Finks naturally triggers its own life gain upon entering the battlefield, the resulting state-based actions cause the +1/+1 and -1/+1 counters to annihilate each other, leaving the Finks fresh and ready to be sacrificed all over again.