How can you create a combo with Cavern Harpy, Parasitic Strix, Aluren?
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[START OF COMBO]This combo can be formed with Cavern Harpy, Parasitic Strix, Aluren

Color identity: BGU
Mana cost: 
Steps:
  1. Cast Parasitic Strix by paying {0}.
  2. Parasitic Strix enters the battlefield, causing target player to lose 2 life and gaining you 2 life.
  3. Cast Cavern Harpy by paying {0}.
  4. Cavern Harpy enters the battlefield, returning Parasitic Strix to your hand.
  5. Activate Cavern Harpy by paying 1 life, returning it to your hand.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite lifeloss
  - Infinite leaves the battlefield
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Cavern Harpy must be in your hand
  - Parasitic Strix must be in your hand
  - Aluren must be on the battlefield
  - You control at least one other black permanent.
[END OF COMBO PREREQUISITES]
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