How can you create a combo with Fool's Demise, Great Whale, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Fool's Demise, Great Whale, Altar of Dementia

Color identity: U
Mana cost: 
Steps:
  1. Activate up to seven lands by tapping them, adding at least {4}{U}.
  2. Activate Altar of Dementia by sacrificing Great Whale.
  3. Fool's Demise's first and second abilities trigger.
  4. Resolve the first Fool's Demise trigger, returning Great Whale from your graveyard to the battlefield.
  5. When Great Whale enters the battlefield, it triggers, untapping up to seven lands.
  6. Resolve the second Fool's Demise trigger, returning Fool's Demise to your hand from your graveyard.
  7. Resolve the Altar of Dementia ability from step 2, causing target player to mill cards equal to Great Whale's power.
  8. Cast Fool's Demise by paying {4}{U}, targeting Great Whale.
  9. Repeat.
  10. If the seven lands can tap to produce at least {5}{U}, this combo nets infinite mana.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana lands you control can produce
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Infinite storm count
  - Infinite untap of lands you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Fool's Demise attached to Great Whale.
  - You control up to seven lands that can tap to produce at least {4}{U}.
[END OF COMBO PREREQUISITES]
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