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

Color identity: B
Mana cost: 
Steps:
  1. Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing Cathodion and returning Chthonian Nightmare from the battlefield to your hand.
  2. When Cathodion dies, it triggers, adding {C}{C}.
  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. Cast Chthonian Nightmare by paying {1}{B}.
  6. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  7. Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing Priest of Gix and returning Chthonian Nightmare from the battlefield to your hand, returning Cathodion from your graveyard to the battlefield.
  8. Cast Chthonian Nightmare by paying {1}{B}.
  9. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  10. Repeat.[END OF COMBO STEPS]

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

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