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

Color identity: B
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Shambling Ghast.
  2. Mortuary, Shambling Ghast and Archghoul of Thraben trigger.
  3. Resolve the Mortuary trigger, putting Shambling Ghast on top of your library.
  4. Resolve the Shambling Ghast trigger, creating a Treasure token.
  5. Resolve the Archghoul of Thraben trigger, revealing Shambling Ghast from the top of your library and putting it into your hand.
  6. Resolve the Altar of Dementia ability, causing target player to mill a number of cards equal to Shambling Ghast's power.
  7. Activate the Treasure token by tapping and sacrificing it, adding {B}.
  8. Cast Shambling Ghast by paying {B}.
  9. 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
[END OF COMBO PREREQUISITES]
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