Priest of Urabrask + Containment Construct + Dream Halls + Cloudstone Curio + Teferi, Mage of Zhalfir

Priest of Urabrask
Containment Construct
Dream Halls
Cloudstone Curio
Teferi, Mage of Zhalfir

Requires
Priest of Urabrask must be in hand. Containment Construct must be on the battlefield. Dream Halls must be on the battlefield. Cloudstone Curio must be on the battlefield. Teferi, Mage of Zhalfir must be on the battlefield. You have a nonartifact red creature card in hand with mana value two or less.
Steps
  1. Cast Priest of Urabrask by discarding another nonartifact red creature card with mana value two or less.
  2. Containment Construct triggers, causing you to exile the discarded card from your graveyard and allowing you to cast it this turn.
  3. Priest of Urabrask enters the battlefield, triggering itself and Cloudstone Curio.
  4. Resolve the Priest of Urabrask trigger, adding .
  5. Holding priority, cast the red creature from exile by paying its mana cost.
  6. The creature enters the battlefield, triggering Cloudstone Curio, returning Priest of Urabrask from the battlefield to your hand.
  7. Resolve the Cloudstone Curio trigger from step 3, returning the red creature to your hand.
  8. Repeat.
Results
Infinite ETB. Infinite LTB. Infinite red mana. Infinite storm count.

Alania, Divergent Storm
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Creatures
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Mirran Spy
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Phyrexian Walker
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Ornithopter
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Reckless Fireweaver
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Archmage Emeritus
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Instants
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Twincast
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Reiterate
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Snap
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Big Score
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Sorceries
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Utility Artifacts
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Enchantments
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Planeswalkers
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Utility Lands
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Mana Artifacts
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