How can you create a combo with Dream Halls, Conspiracy Theorist, Petals of Insight, Aethertide Whale?
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[START OF COMBO]This combo can be formed with Dream Halls, Conspiracy Theorist, Petals of Insight, Aethertide Whale

Color identity: UR
Mana cost: 
Steps:
  1. Cast Petals of Insight by discarding Aethertide Whale.
  2. Conspiracy Theorist triggers, exiling Aethertide Whale and allowing you to cast it from exile this turn.
  3. Resolve Petals of Insight, putting the top three cards of your library on the bottom of your library, and returning Petals of Insight to your hand.
  4. Cast Aethertide Whale from exile by discarding Petals of Insight.
  5. Conspiracy Theorist triggers, exiling Petals of Insight and allowing you to cast it from exile this turn.
  6. Aethertide Whale enters the battlefield, causing you to get six {E}.
  7. Activate Aethertide Whale by paying {E}{E}{E}{E}, returning it to your hand from the battlefield.
  8. Cast Petals of Insight from exile by discarding Aethertide Whale.
  9. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite energy counters
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite self-discard triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Dream Halls must be on the battlefield
  - Conspiracy Theorist must be on the battlefield
  - Petals of Insight must be in your hand
  - Aethertide Whale must be in your hand
[END OF COMBO PREREQUISITES]
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