How can you create a combo with Baral's Expertise, Dockside Extortionist, Nivix Guildmage?
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[START OF COMBO]This combo can be formed with Baral's Expertise, Dockside Extortionist, Nivix Guildmage

Color identity: UR
Mana cost: {5}{U}{U}{U}{R}
Steps:
  1. Cast Baral's Expertise by paying {3}{U}{U}.
  2. Holding priority, activate Nivix Guildmage's second ability by paying {2}{U}{R}, copying Baral's Expertise.
  3. Resolve the copy of Baral's Expertise, returning Dockside Extortionist from the battlefield to your hand, and casting Dockside Extortionist from your hand without paying its mana cost.
  4. Dockside Extortionist enters the battlefield, creating at least five Treasure tokens.
  5. Activate four Treasure tokens by tapping and sacrificing them, adding {2}{U}{R}.
  6. Repeat from step 2.
  7. Once you have infinite mana, you may use it to activate Nivix Guildmage's first ability to loot infinitely.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite draw triggers
  - Infinite enters the battlefield
  - Infinite looting
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite self-discard triggers
  - Infinite storm count
  - Infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Baral's Expertise must be in your hand
  - Dockside Extortionist must be on the battlefield
  - Nivix Guildmage must be on the battlefield
  - Opponents control at least five artifacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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