How can you create a combo with Havengul Lich, Rooftop Storm, Warren Soultrader, Gray Merchant of Asphodel?
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[START OF COMBO]This combo can be formed with Havengul Lich, Rooftop Storm, Warren Soultrader, Gray Merchant of Asphodel

Color identity: UB
Mana cost: {1}
Steps:
  1. Activate Havengul Lich by paying {1}, allowing you to cast Gray Merchant from your graveyard this turn.
  2. Cast Gray Merchant from your graveyard by paying {0} due to Rooftop Storm.
  3. When Gray Merchant enters the battlefield, it triggers, causing each opponent to lose life equal to your devotion to black and you to gain life equal to the life lost this way.
  4. Activate Warren Soultrader by paying 1 life and sacrificing Gray Merchant, creating a Treasure token.
  5. Activate the Treasure by tapping and sacrificing it, adding {1}.
  6. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - Havengul Lich must be on the battlefield
  - Rooftop Storm must be on the battlefield
  - Warren Soultrader must be on the battlefield
  - Gray Merchant of Asphodel must be in the graveyard
[END OF COMBO PREREQUISITES]
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