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

Color identity: BGU
Mana cost: {G}{G}
Steps:
  1. Cast Channel by paying {G}{G}.
  2. Activate Phyrexian Altar by sacrificing Skemfar Shadowsage, adding {U}.
  3. When Skemfar Shadowsage dies, Fool's Demise's first and second abilities trigger.
  4. Resolve the first Fool's Demise trigger, returning Skemfar Shadowsage from your graveyard to the battlefield.
  5. When Skemfar Shadowsage enters the battlefield, it triggers, causing you to gain at least 4 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 Skemfar Shadowsage.
  9. Repeat from step 2.
  10. If you control five or more creatures that share a creature type, this combo nets infinite lifegain and colorless mana.[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
  - Skemfar Shadowsage must be on the battlefield
  - Fool's Demise attached to Skemfar Shadowsage.
  - You control at least four creatures that share a creature type.
[END OF COMBO PREREQUISITES]
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