Altar of Dementia, Magnanimous Magistrate, Phantasmal Image, and Phyrexian Metamorph

Prerequisites

• Altar of Dementia on the battlefield
• Magnanimous Magistrate on the battlefield
• Phantasmal Image on the battlefield
• Phyrexian Metamorph on the battlefield
• At least two reprieve counters on Magnanimous Magistrate or Phyrexian Metamorph

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

Results

• Infinite blinking of creatures on the battlefield, in graveyard, and in library
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill