How can you create a combo with Xavier Sal, Infested Captain, Haunted One, Hyrax Tower Scout, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Xavier Sal, Infested Captain, Haunted One, Hyrax Tower Scout, Altar of Dementia

Color identity: BGU
Mana cost: 
Steps:
  1. Activate Xavier Sal's first ability by tapping it and removing a +1/+1 counter from Hyrax Tower Scout if it has one, or any counter from another permanent you control otherwise.
  2. Xavier Sal triggers, causing it and all other creatures you control that share a creature type with it to get +2/+0 and gain undying until end of turn.
  3. Resolve the Xavier Sal ability, causing you to populate.
  4. Activate Altar of Dementia by sacrificing Hyrax Tower Scout.
  5. When Hyrax Tower Scout dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. When Hyrax Tower Scout enters the battlefield, it triggers, untapping Xavier Sal.
  7. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Hyrax Tower Scout's power.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite leaves the battlefield
  - Infinite enters the battlefield
  - Infinite sacrifice triggers
  - Infinite death triggers
  - Infinite mill
  - Infinite self-mill
  - Infinite copies of creature tokens you control
  - Infinitely powerful Humans, Fungi and Pirates you control until end of turn except Hyrax Tower Scout[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - There is at least one counter on a permanent you control except Xavier Sal.
  - Xavier Sal does not have summoning sickness.
  - Hyrax Tower Scout has no more than one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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