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

Color identity: B
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Cavalier of Night.
  2. When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night.
  3. When Activated Sleeper 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. Activate Altar of Dementia by sacrificing Activated Sleeper.
  6. When Activated Sleeper dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night.
  7. When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature.
  8. Resolve the Altar of Dementia ability from step 5.
  9. Repeat from step 5.[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:
  - Cavalier of Night must be on the battlefield
  - Activated Sleeper must be in the graveyard
  - Altar of Dementia must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant