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

Color identity: B
Mana cost: 
Steps:
  1. Activate Ashnod's Altar by sacrificing Cavalier of Night, adding {C}{C}.
  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, it triggers; choose not to sacrifice a creature.
  4. Activate Ashnod's Altar by sacrificing Activated Sleeper, adding {C}{C}.
  5. When Activated Sleeper dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night.
  6. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Cavalier of Night must be on the battlefield
  - Activated Sleeper must be in the graveyard
  - Ashnod's Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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