How can you create a combo with Mercurial Pretender, Dockside Extortionist?
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[START OF COMBO]This combo can be formed with Mercurial Pretender, Dockside Extortionist

Color identity: UR
Mana cost: {4}{U}
Steps:
  1. Cast Mercurial Pretender by paying {4}{U}, choosing to have it enter the battlefield as a copy of Dockside Extortionist.
  2. Mercurial Pretender enters the battlefield, creating at least ten Treasure tokens.
  3. Activate nine Treasure tokens by tapping and sacrificing them, adding {6}{U}{U}{U}.
  4. Activate Mercurial Pretender by paying {2}{U}{U}, returning it from the battlefield to your hand.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite storm count
  - Infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mercurial Pretender must be in your hand
  - Dockside Extortionist must be on the battlefield
  - Opponents control at least ten artifacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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