How can you create a combo with Skeleton Ship, Intruder Alarm, Geralf's Mindcrusher, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Skeleton Ship, Intruder Alarm, Geralf's Mindcrusher, Altar of Dementia

Color identity: UB
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Geralf's Mindcrusher.
  2. Geralf's Mindcrusher dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. Geralf's Mindcrusher enters the battlefield, triggering itself and Intruder Alarm.
  4. Resolve the Geralf's Mindcrusher trigger, causing target player to mill five cards.
  5. Resolve the Intruder Alarm trigger, untapping all creatures.
  6. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to Geralf's Mindcrusher's power.
  7. Activate Skeleton Ship by tapping it, putting a -1/-1 counter on Geralf's Mindcrusher.
  8. Repeat.[END OF COMBO STEPS]

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

Other prerequisites:
  - All permanants must be on the battlefield
  - Skeleton Ship does not have summoning sickness.
  - Geralf's Mindcrusher does not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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