How can you create a combo with Heidar, Rimewind Master, Dockside Extortionist, Intruder Alarm?
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[START OF COMBO]This combo can be formed with Heidar, Rimewind Master, Dockside Extortionist, Intruder Alarm

Color identity: UR
Mana cost: {1}{R}
Steps:
  1. Cast Dockside Extortionist by paying {1}{R}.
  2. Dockside Extortionist enters the battlefield, triggering itself and Intruder Alarm.
  3. Resolve the Dockside Extortionist trigger, creating at least five Treasure tokens.
  4. Resolve the Intruder Alarm trigger, untapping all creatures.
  5. Activate four Treasure tokens by tapping and sacrificing them, adding {3}{R}.
  6. Activate Heidar by paying {2} and tapping it, returning Dockside Extortionist from the battlefield to your hand.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana creatures you control can produce
  - Infinite storm count
  - Infinite Treasure tokens
  - Infinite untap of creatures you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Heidar, Rimewind Master must be on the battlefield
  - Dockside Extortionist must be in your hand
  - Intruder Alarm must be on the battlefield
  - You control at least four snow permanents.
  - Opponents control at least five artifacts and/or enchantments.
  - Heidar does not have summoning sickness.
[END OF COMBO PREREQUISITES]
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