How can you create a combo with Orvar, the All-Form, Whim of Volrath, Dockside Extortionist?
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[START OF COMBO]This combo can be formed with Orvar, the All-Form, Whim of Volrath, Dockside Extortionist

Color identity: UR
Mana cost: {2}{U}
Steps:
  1. Cast Whim of Volrath with buyback by paying {2}{U}, targeting Dockside Extortionist.
  2. Orvar's first ability triggers, creating a token copy of Dockside Extortionist.
  3. The token Dockside Extortionist enters the battlefield, creating at least four Treasure tokens.
  4. Resolve Whim of Volrath, changing nothing and returning it to your hand.
  5. Activate three Treasure tokens by tapping and sacrificing them, adding {2}{U}.
  6. Repeat.
  7. Once you have infinite mana, you can target any permanents you control in step 1 to create infinite token copies of them.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite copies of permanents you control
  - Infinite magecraft triggers
  - Infinite storm count
  - Infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Orvar, the All-Form must be on the battlefield
  - Whim of Volrath must be in your hand
  - Dockside Extortionist must be on the battlefield
  - Opponents control at least four artifacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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