Cavalier of Night + Mirror Image + Altar of Dementia

Cavalier of Night
Mirror Image
Altar of Dementia

Requires
Cavalier of Night must be on the battlefield. Mirror Image must be on the battlefield (as a copy of Cavalier of Night). Altar of Dementia must be on the battlefield.
Steps
  1. Activate Altar of Dementia by sacrificing Mirror Image.
  2. When Mirror Image dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night.
  3. When Mirror Image enters the battlefield, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature.
  4. Resolve the Altar of Dementia ability from step 1.
  5. Repeat.
Results
Infinite death triggers. Infinite ETB. Infinite LTB. Infinite mill. Infinite sacrifice triggers. Infinite self-mill.

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