How can you create a combo with Nim Deathmantle, Altar of Dementia, Great Whale?
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[START OF COMBO]This combo can be formed with Nim Deathmantle, Altar of Dementia, Great Whale

Color identity: U
Mana cost: 
Steps:
  1. Activate up to seven lands by tapping them, adding at least {4}.
  2. Activate Altar of Dementia by sacrificing Great Whale.
  3. When Great Whale dies, Nim Deathmantle triggers, returning Great Whale from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
  4. When Great Whale enters the battlefield, it triggers, untapping up to seven lands.
  5. Resolve the Altar of Dementia ability from step 2, causing target player to mill cards equal to Great Whale's power.
  6. Repeat.
  7. If the lands can tap to produce at least {5}, 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 untap of lands you control[END OF COMBO RESULT][END OF COMBO]

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