How can you create a combo with Chthonian Nightmare, Dockside Extortionist?
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[START OF COMBO]This combo can be formed with Chthonian Nightmare, Dockside Extortionist

Color identity: BR
Mana cost: 
Steps:
  1. Activate Chthonian Nightmare by paying {E}{E}, sacrificing a nontoken creature with mana value 4 or less and returning Chthonian Nightmare from the battlefield to your hand, returning Dockside Extortionist from your graveyard to the battlefield.
  2. When Dockside Extortionist enters the battlefield, it triggers, creating at least four Treasure tokens.
  3. Activate four Treasures by tapping and sacrificing them, adding {2}{B}{B}.
  4. Cast Chthonian Nightmare by paying {1}{B}.
  5. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  6. Activate Chthonian Nightmare by paying at most {E}{E}{E}{E}, sacrificing Dockside Extortionist and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 4 or less from your graveyard to the battlefield.
  7. Cast Chthonian Nightmare by paying {1}{B}.
  8. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  9. Repeat.
  10. If opponents control five or more artifacts and/or enchantments, this combo nets infinite Treasure tokens and colored mana.
  11. If the creature sacrificed has mana value 3 or less, this combo nets infinite energy counters.[END OF COMBO STEPS]

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

Other prerequisites:
  - Chthonian Nightmare must be on the battlefield
  - Dockside Extortionist must be in the graveyard
  - You have at least two energy counters.
  - Opponents control at least four artifacts and/or enchantments.
  - You control another nontoken creature with mana value 4 or less.
[END OF COMBO PREREQUISITES]
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