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

Color identity: GU
Mana cost: {G}{G}
Steps:
  1. Cast Channel by paying {G}{G}.
  2. Activate Phyrexian Altar by sacrificing Hollowhenge Scavenger, adding {U}.
  3. When Hollowhenge Scavenger dies, Fool's Demise's first and second abilities trigger.
  4. Resolve the first Fool's Demise trigger, returning Hollowhenge Scavenger from your graveyard to the battlefield.
  5. When Hollowhenge Scavenger enters the battlefield, it triggers, causing you to gain 5 life.
  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 Hollowhenge Scavenger.
  9. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - 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
  - Hollowhenge Scavenger must be on the battlefield
  - Fool's Demise attached to Hollowhenge Scavenger.
[END OF COMBO PREREQUISITES]
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