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

Color identity: UR
Mana cost: 
Steps:
  1. Cast Petals of Insight by discarding Aven Surveyor.
  2. Conspiracy Theorist triggers, exiling Aven Surveyor 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 Aven Surveyor 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. Aven Surveyor enters the battlefield, returning itself from the battlefield to your hand.
  7. Cast Petals of Insight from exile by discarding Aven Surveyor.
  8. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - 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
  - Aven Surveyor must be in your hand
[END OF COMBO PREREQUISITES]
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