How can you create a combo with Magnanimous Magistrate, Phantasmal Image, Phyrexian Metamorph, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Magnanimous Magistrate, Phantasmal Image, Phyrexian Metamorph, Altar of Dementia

Color identity: WU
Mana cost: 
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.[END OF COMBO STEPS]

Result:
  - Infinite blinking of creatures on the battlefield, in graveyard, and in library
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - At least two reprieve counters on Magnanimous Magistrate or Phyrexian Metamorph.
[END OF COMBO PREREQUISITES]
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