How can you create a combo with Fool's Demise, Channel, Phyrexian Altar, Gray Merchant of Asphodel?
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[START OF COMBO]This combo can be formed with Fool's Demise, Channel, Phyrexian Altar, Gray Merchant of Asphodel

Color identity: BGU
Mana cost: {G}{G}
Steps:
  1. Cast Channel by paying {G}{G}.
  2. Activate Phyrexian Altar by sacrificing Gray Merchant of Asphodel, adding {U}.
  3. When Gray Merchant of Asphodel dies, Fool's Demise's first and second abilities trigger.
  4. Resolve the first Fool's Demise trigger, returning Gray Merchant of Asphodel from your graveyard to the battlefield.
  5. When Gray Merchant of Asphodel 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.
  6. Resolve the second Fool's Demise trigger, returning it from your graveyard to your hand.
  7. Activate Channel four times by paying 4 life, adding {C}{C}{C}{C}.
  8. Cast Fool's Demise by paying {4}{U}, attaching it to Gray Merchant of Asphodel.
  9. Repeat from step 2.[END OF COMBO STEPS]

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

Other prerequisites:
  - Fool's Demise must be on the battlefield
  - Channel must be in your hand
  - Phyrexian Altar must be on the battlefield
  - Gray Merchant of Asphodel must be on the battlefield
  - Fool's Demise attached to Gray Merchant of Asphodel.
  - You have at least two opponents, or your devotion to black is at least four.
[END OF COMBO PREREQUISITES]
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