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

Color identity: UR
Mana cost: 
Steps:
  1. Cast the buyback spell with buyback by paying its mana cost plus its buyback cost.
  2. Displacer Kitten triggers, blinking Dockside Extortionist.
  3. When Dockside Extortionist enters the battlefield, it triggers, creating a number of Treasure artifact tokens equal to the number of artifacts and/or enchantments opponents control.
  4. Resolve the buyback spell, performing its listed effect and returning it to your hand.
  5. Activate a Treasure by tapping and sacrificing it, adding one mana of any color.
  6. Repeat step 5 until you have enough mana to cast the buyback spell with buyback.
  7. Repeat from step 1.[END OF COMBO STEPS]

Result:
  - Infinite blinking of nonland permanents you control
  - Infinite colored mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite storm count
  - Infinite Treasure tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - You have enough mana to cast the buyback spell with buyback.
  - Opponents control a number of artifacts and/or enchantments equal to or greater than one plus the number of Treasure tokens that would be required to cast the buyback spell with buyback.
  - There are legal targets for the buyback spell, if applicable.
[END OF COMBO PREREQUISITES]
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