How can you create a combo with Arni Metalbrow, Thousand-Faced Shadow, Cloudstone Curio, Priest of Urabrask?
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[START OF COMBO]This combo can be formed with Arni Metalbrow, Thousand-Faced Shadow, Cloudstone Curio, Priest of Urabrask

Color identity: UR
Mana cost: {1}{R}
Steps:
  1. Declare Priest of Urabrask as an attacker.
  2. Arni Metalbrow triggers, causing you to pay {1}{R} to put Thousand-Faced Shadow from your hand onto the battlefield tapped and attacking.
  3. When Thousand-Faced Shadow enters the battlefield, it, Arni Metalbrow and Cloudstone Curio trigger.
  4. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
  5. Resolve the Arni Metalbrow trigger, choosing not to pay.
  6. Resolve the Thousand-Faced Shadow trigger, creating a token copy of Priest of Urabrask that enters the battlefield tapped and attacking.
  7. When the Priest of Urabrask token enters the battlefield, it, Arni Metalbrow and Cloudstone Curio trigger.
  8. Resolve the Priest of Urabrask trigger, adding {R}{R}{R}.
  9. Resolve the Cloudstone Curio trigger, returning Thousand-Faced Shadow to your hand from the battlefield.
  10. Resolve the Arni Metalbrow trigger, causing you to pay {1}{R} to put Thousand-Faced Shadow from your hand onto the battlefield tapped and attacking.
  11. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite red mana
  - Infinite tapped creature tokens that are attacking[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Arni Metalbrow must be on the battlefield
  - Thousand-Faced Shadow must be in your hand
  - Cloudstone Curio must be on the battlefield
  - Priest of Urabrask must be on the battlefield
  - Priest of Urabrask does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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