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

Color identity: UR
Mana cost: {1}{R}
Steps:
  1. Declare Dockside Extortionist 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 Dockside Extortionist that enters the battlefield tapped and attacking.
  7. When the Dockside Extortionist token enters the battlefield, it, Arni Metalbrow and Cloudstone Curio trigger.
  8. Resolve the Dockside Extortionist trigger, creating at least two Treasure tokens.
  9. Activate two Treasures by tapping and sacrificing them, adding {1}{R}.
  10. Resolve the Cloudstone Curio trigger, returning Thousand-Faced Shadow to your hand from the battlefield.
  11. 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.
  12. Repeat from step 3.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count
  - Infinite tapped creature tokens that are attacking
  - Infinite Treasure tokens[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
  - Dockside Extortionist must be on the battlefield
  - Dockside Extortionist does not have summoning sickness.
  - Opponents control at least two artifacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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