How can you create a combo with Chthonian Nightmare, Priest of Gix, Skittering Precursor, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Chthonian Nightmare, Priest of Gix, Skittering Precursor, Altar of Dementia

Color identity: BR
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Priest of Gix.
  2. When Priest of Gix dies, Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token.
  3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Priest of Gix's power.
  4. Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing the Eldrazi Spawn and returning Chthonian Nightmare from the battlefield to your hand, returning Priest of Gix from your graveyard to the battlefield.
  5. When Priest of Gix enters the battlefield, it triggers, adding {B}{B}{B}.
  6. Cast Chthonian Nightmare by paying {1}{B}.
  7. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  8. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - You have at least {E}{E}{E}.
[END OF COMBO PREREQUISITES]
assistant