Chthonian Nightmare + Heliod, the Radiant Dawn // Heliod, the Warped Eclipse Combos

2 known combos featuring both cards in Commander

Infinite ETB Infinite LTB Infinite death triggers Infinite energy counters Infinite sacrifice triggers

Combo 1 with Greedy Freebooter + Shambling Ghast

Results: Infinite ETB · Infinite LTB · Infinite death triggers · Infinite energy counters · Infinite sacrifice triggers · Infinite scry 1 · Infinite storm count
Steps
  1. Cast Chthonian Nightmare by paying {B}.
  2. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  3. Activate Chthonian Nightmare by paying {E}, sacrificing Greedy Freebooter and returning Chthonian Nightmare from the battlefield to your hand.
  4. When Greedy Freebooter dies, it triggers, causing you to scry 1 and create a Treasure token.
  5. Resolve the Chthonian Nightmare ability, returning Shambling Ghast from your graveyard to the battlefield.
  6. Activate the Treasure by tapping and sacrificing it, adding {B}.
  7. Cast Chthonian Nightmare by paying {B}.
  8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  9. Activate Chthonian Nightmare by paying {E}, sacrificing Shambling Ghast and returning Chthonian Nightmare from the battlefield to your hand.
  10. When Shambling Ghast dies, it triggers, creating a Treasure token.
  11. Resolve the Chthonian Nightmare ability, returning Greedy Freebooter from your graveyard to the battlefield.
  12. Activate the Treasure by tapping and sacrificing it, adding {B}.
  13. Repeat.

Combo 2 with Patron of the Arts

Also requires: Patron of the Arts Patron of the Arts
Results: Infinite ETB · Infinite LTB · Infinite death triggers · Infinite energy counters · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Activate Chthonian Nightmare by paying at most {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 another creature card from your graveyard to the battlefield.
  4. Activate the Treasure by tapping and sacrificing it, adding {B}.
  5. Cast Chthonian Nightmare by paying {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 another creature and returning Chthonian Nightmare from the battlefield to your hand, returning Patron of the Arts from your graveyard to the battlefield.
  8. When Patron of the Arts enters the battlefield, it triggers, creating a Treasure token.
  9. Activate the Treasure by tapping and sacrificing it, adding {B}.
  10. Cast Chthonian Nightmare by paying {B}.
  11. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  12. Repeat.
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