How can you create a combo with Necroduality, Rot Hulk, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Necroduality, Rot Hulk, Altar of Dementia

Color identity: UB
Mana cost: {5}{B}{B}
Steps:
  1. Cast Rot Hulk by paying {5}{B}{B}.
  2. Rot Hulk enters the battlefield, triggering itself and Necroduality.
  3. Holding priority, activate Altar of Dementia by sacrificing Rot Hulk, causing target player to mill cards equal to Rot Hulk's power.
  4. Resolve the Rot Hulk trigger, failing to return anything to the battlefield.
  5. Resolve the Necroduality trigger, creating a token copy of Rot Hulk.
  6. The token copy of Rot Hulk enters the battlefield, returning Rot Hulk from your graveyard to the battlefield.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Put all Zombies from your library and graveyard onto the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Necroduality must be on the battlefield
  - Rot Hulk must be in your hand
  - Altar of Dementia must be on the battlefield
[END OF COMBO PREREQUISITES]
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