How can you create a combo with Phyrexian Unlife, Repay in Kind, Necropotence?
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[START OF COMBO]This combo can be formed with Phyrexian Unlife, Repay in Kind, Necropotence

Color identity: WB
Mana cost: {5}{B}{B}
Steps:
  1. Activate Necropotence by paying 1 life, exiling the top card of your library.
  2. Repeat until your life total is 0.
  3. Cast Repay in Kind by paying {5}{B}{B}, causing each player's life total to become 0.[END OF COMBO STEPS]

Result:
  - Exile your library
  - Infinite lifeloss[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Phyrexian Unlife must be on the battlefield
  - Repay in Kind must be in your hand
  - Necropotence must be on the battlefield
[END OF COMBO PREREQUISITES]
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