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

Color identity: UB
Mana cost: 
Steps:
  1. Activate up to five lands by tapping them, adding at least {2}{B}{B}.
  2. Activate Chthonian Nightmare by paying at most {E}, sacrificing Peregrine Drake and returning Chthonian Nightmare from the battlefield to your hand, returning a creature with mana value 1 or less from your graveyard to the battlefield.
  3. Cast Chthonian Nightmare by paying {1}{B}.
  4. When Chthonian Nightmare enters the battlefield, it triggers, giving you {E}{E}{E}.
  5. Activate Chthonian Nightmare by paying {E}{E}{E}{E}{E}, sacrificing a nontoken creature with mana value 1  or less and returning Chthonian Nightmare from the battlefield to your hand, returning Peregrine Drake from your graveyard to the battlefield. 
  6. When Peregrine Drake enters the battlefield, it triggers, untapping up to five lands.
  7. Cast Chthonian Nightmare by paying {1}{B}.
  8. When Chthonian Nightmare enters the battlefield, it triggers, giving you {E}{E}{E}.
  9. Repeat.
  10. If the five lands can tap to produce at least {3}{B}{B}, this combo nets infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana lands you control can produce
  - Infinite sacrifice triggers
  - Infinite storm count
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have at least one energy counter.
  - You control up to five lands that can tap to produce at least {2}{B}{B}.
[END OF COMBO PREREQUISITES]
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