Magnanimous Magistrate, Opalescence, Dance of Many, and Altar of Dementia

Prerequisites

• Magnanimous Magistrate on the battlefield
• Opalescence on the battlefield
• Dance of Many in hand
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Dance of Many by paying
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

Results

• Infinite blinking of creatures with mana value 3 or less on the battlefield, in graveyard, and in library
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill