How can you create a combo with Midnight Guard, Banishing Knack, Dockside Extortionist?
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[START OF COMBO]This combo can be formed with Midnight Guard, Banishing Knack, Dockside Extortionist

Color identity: URW
Mana cost: {1}{R}
Steps:
  1. Cast Dockside Extortionist by paying {1}{R}.
  2. Dockside Extortionist enters the battlefield, triggering itself and Midnight Guard.
  3. Resolve the Dockside Extortionist trigger, creating at least 3 Treasure tokens.
  4. Resolve the Midnight Guard trigger, untapping it.
  5. Activate a Treasure token by tapping and sacrificing it, adding {U}.
  6. Cast Banishing Knack by paying {U} targeting Midnight Guard.
  7. Activate Midnight Guard by tapping it, returning Dockside Extortionist from the battlefield to your hand.
  8. Activate two Treasure tokens by tapping and sacrificing them, adding {1}{R}.
  9. Cast Dockside Extortionist by paying {1}{R}.
  10. Dockside Extortionist enters the battlefield, triggering itself and Midnight Guard.
  11. Resolve the Dockside Extortionist trigger, creating at least 3 Treasure tokens.
  12. Resolve the Midnight Guard trigger, untapping it.
  13. Repeat from step 7.[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:
  - Midnight Guard must be on the battlefield
  - Banishing Knack must be in your hand
  - Dockside Extortionist must be in your hand
  - Midnight Guard does not have summoning sickness.
  - Opponents control at least three artifacts and/or enchantments.
[END OF COMBO PREREQUISITES]
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