Altar of Dementia + Magnanimous Magistrate Combos

3 known combos featuring both cards in Commander

Infinite ETB Infinite LTB Infinite mill Infinite self-mill Infinite death triggers

Combo 1 with Phantasmal Image + Phyrexian Metamorph

Results: Infinite blinking of creatures on the battlefield and creature cards in graveyard and in library · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers · Infinite self-mill
Steps
  1. Activate Altar of Dementia by sacrificing Phantasmal Image.
  2. Magnanimous Magistrate and Phyrexian Metamorph trigger.
  3. Resolve one trigger, removing two reprieve counters from a creature and returning Phantasmal Image from your graveyard to the battlefield as a copy of Magnanimous Magistrate.
  4. Resolve the other trigger, declining to act.
  5. Activate Altar of Dementia by sacrificing Phyrexian Metamorph.
  6. Magnanimous Magistrate and Phantasmal Image trigger.
  7. Resolve Phantasmal Image's trigger, removing four reprieve counters from it and returning Phyrexian Metamorph from your graveyard to the battlefield as a copy of Magnanimous Magistrate.
  8. Resolve the other trigger, declining to act.
  9. Repeat any number of times.
  10. Resolve all Altar of Dementia abilities, milling any number of players any amount of cards.
  11. You may sacrifice and return any number of creatures in your graveyard any number of times.

Combo 2 with Opalescence + Dance of Many

Results: Infinite blinking of some creatures and some creature cards in graveyard and in library · Infinite death triggers · Infinite self-mill · Infinite ETB · Infinite LTB · Infinite mill · Infinite sacrifice triggers
Show steps
  1. Cast Dance of Many by paying {U}{U}.
  2. Dance of Many enters the battlefield, creating a token copy of Magnanimous Magistrate.
  3. Activate Altar of Dementia by sacrificing Dance of Many.
  4. Dance of Many, Magnanimous Magistrate, and the token Magnanimous Magistrate trigger.
  5. Resolve the nontoken Magnanimous Magistrate trigger, declining to act.
  6. Resolve the token Magnanimous Magistrate trigger, removing two reprieve counters from it and returning Dance of Many from your graveyard to the battlefield.
  7. Dance of Many enters the battlefield, creating a token copy of Magnanimous Magistrate.
  8. Resolve the Dance of Many trigger, exiling the first Magnanimous Magistrate token.
  9. Repeat from step 3 any number of times.
  10. Resolve all Altar of Dementia abilities, milling any number of players any amount of cards.
  11. You may sacrifice and return any number of creatures with mana value 3 or less in your graveyard any number of times.

Combo 3 with Pir, Imaginative Rascal + Pollenbright Druid

Results: Infinite ETB · Infinite LTB · Infinite mill · Infinite self-mill
Show steps
  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.
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