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

Color identity: B
Mana cost: 
Steps:
  1. Activate Yahenni, Undying Partisan 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 Yahenni, Undying Partisan ability from step 1.
  5. Activate Yahenni, Undying Partisan 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 Yahenni, Undying Partisan 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 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
  - Yahenni, Undying Partisan must be on the battlefield
[END OF COMBO PREREQUISITES]
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