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

Color identity: U
Mana cost: 
Steps:
  1. Activate up to seven lands by tapping them, adding at least {3}{U}.
  2. Activate Phyrexian Altar by sacrificing Great Whale, adding one mana of any color.
  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. Cast Fool's Demise by paying {4}{U}, targeting Great Whale.
  8. Repeat.
  9. If the seven lands can tap to produce at least {4}{U}, this combo nets infinite colored mana.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - 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 {3}{U}.
[END OF COMBO PREREQUISITES]
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