How can you create a combo with Chthonian Nightmare, Priest of Gix, Shambling Ghast?
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[START OF COMBO]This combo can be formed with Chthonian Nightmare, Priest of Gix, Shambling Ghast

Color identity: B
Mana cost: 
Steps:
  1. Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing Shambling Ghast and returning Chthonian Nightmare from the battlefield to your hand.
  2. When Shambling Ghast dies, it triggers, creating a Treasure token.
  3. Resolve the Chthonian Nightmare ability, returning Priest of Gix from your graveyard to the battlefield.
  4. When Priest of Gix enters the battlefield, it triggers, adding {B}{B}{B}.
  5. Activate the Treasure by tapping and sacrificing it, adding {1}.
  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. Activate Chthonian Nightmare by paying {E}, sacrificing Priest of Gix and returning Chthonian Nightmare from the battlefield to your hand, returning Shambling Ghast from your graveyard to the battlefield.
  9. Cast Chthonian Nightmare by paying {1}{B}.
  10. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  11. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite leaves the battlefield
  - Infinite enters the battlefield
  - Infinite sacrifice triggers
  - Infinite death triggers
  - Infinite storm count
  - Infinite energy counters[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Chthonian Nightmare must be on the battlefield
  - Priest of Gix must be in the graveyard
  - Shambling Ghast must be on the battlefield
  - You have at least three energy counters.
[END OF COMBO PREREQUISITES]
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