How can you create a combo with Gravebane Zombie, Bolas's Citadel, Elesh Norn, Mother of Machines, Angelic Chorus, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Gravebane Zombie, Bolas's Citadel, Elesh Norn, Mother of Machines, Angelic Chorus, Altar of Dementia

Color identity: WB
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Gravebane Zombie, causing target player to mill cards equal to Gravebane Zombie's power.
  2. Gavebane Zombie is put on top of your library instead of your graveyard.
  3. Cast Gravebane Zombie from the top of your library by paying four life.
  4. When Gravebane Zombie enters the battlefield, Angelic Chorus triggers twice, causing you to gain four life.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain triggers
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Your life total is at least five.
[END OF COMBO PREREQUISITES]
assistant