How can you create a combo with Archghoul of Thraben, Mortuary, Rooftop Storm, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Archghoul of Thraben, Mortuary, Rooftop Storm, Altar of Dementia

Color identity: UB
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Archghoul of Thraben.
  2. Mortuary and Archghoul of Thraben trigger.
  3. Resolve the Mortuary trigger, putting Archghoul of Thraben on top of your library from your graveyard.
  4. Resolve the Archghoul of Thraben trigger, revealing Archghoul of Thraben from the top of your library and putting it into your hand.
  5. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Archghoul of Thraben's power.
  6. Cast Archghoul of Thraben by paying {0}.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - 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
  - You control another nontoken Zombie.
[END OF COMBO PREREQUISITES]
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