Cathodion + Chthonian Nightmare Combos

2 known combos featuring both cards in Commander

Infinite colorless mana Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers

Combo 1 with Priest of Gix

Also requires: Priest of Gix Priest of Gix
Results: Infinite black mana · Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
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}{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.

Combo 2 with Patron of the Arts

Also requires: Patron of the Arts Patron of the Arts
Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite colorless mana
Show steps
  1. Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing Patron of the Arts and returning Chthonian Nightmare from the battlefield to your hand.
  2. When Patron of the Arts dies, it triggers, creating a Treasure token.
  3. Resolve the Chthonian Nightmare ability, returning Cathodion from your graveyard to the battlefield.
  4. Activate the Treasure by tapping and sacrificing it, adding {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 Cathodion and returning Chthonian Nightmare from the battlefield to your hand.
  8. When Cathodion dies, it triggers, adding {C}{C}{C}.
  9. Resolve the Chthonian Nightmare ability, returning Patron of the Arts from your graveyard to the battlefield.
  10. When Patron of the Arts enters the battlefield, it triggers, creating a Treasure token.
  11. Activate the Treasure by tapping and sacrificing it, adding {B}.
  12. Cast Chthonian Nightmare by paying {1}{B}.
  13. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  14. Repeat.
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