Moritte of the Frost as a copy of the creature with persist.).
Steps
Activate
Altar of Dementia by sacrificing
Moritte of the Frost.
When
Moritte of the Frost dies, it triggers its persist ability, returning itself to the battlefield as a copy of the creature with persist with two +1/+1 counters and one -1/-1 counter on it.
Remove one +1/+1 counter and one -1/-1 counter from
Moritte of the Frost as a state-based action.
Resolve the activated ability from step 1, milling target player a number of cards equal to Morrite of the Frost's power.
Repeat.
Results
Infinite death triggers.
Infinite creature ETB.
Infinite creature LTB.
Infinite mill.
Infinite creature sacrifice triggers.
Infinite self-mill.
Metadata
Bracket tag
SpicyBracket 3-4+
Probably 3 or 4, but hard to classify
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1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.