How can you create a combo with Dream Halls, Containment Construct, Petals of Insight, Man-o'-War?
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[START OF COMBO]This combo can be formed with Dream Halls, Containment Construct, Petals of Insight, Man-o'-War

Color identity: U
Mana cost: 
Steps:
  1. Cast Petals of Insight by discarding Man-o'-War.
  2. Containment Construct triggers, exiling Man-o'-War 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 Man-o'-War from exile by discarding Petals of Insight.
  5. Containment Construct triggers, exiling Petals of Insight and allowing you to cast it from exile this turn.
  6. Man-o'-War enters the battlefield, returning itself from the battlefield to your hand.
  7. Cast Petals of Insight from exile by discarding Man-o'-War.
  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
  - Containment Construct must be on the battlefield
  - Petals of Insight must be in your hand
  - Man-o'-War must be in your hand
[END OF COMBO PREREQUISITES]
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