Dream Halls, Conspiracy Theorist, Petals of Insight, and Man-o'-War

Prerequisites

• Dream Halls on the battlefield
• Conspiracy Theorist on the battlefield
• Petals of Insight in hand
• Man-o'-War in hand

Steps

1. Cast Petals of Insight by discarding Man-o'-War
2. Conspiracy Theorist 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. Conspiracy Theorist 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

Results

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite self-discard triggers
• Infinite storm count