How can you create a combo with Cavalier of Night, Mirror Image, Altar of Dementia?
user
[START OF COMBO]This combo can be formed with Cavalier of Night, Mirror Image, Altar of Dementia

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

Result:
  - 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
  - 
[END OF COMBO PREREQUISITES]
assistant