How can you create a combo with Vohar, Vodalian Desecrator, Haunted One, Cauldron of Souls, Deceiver Exarch, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Vohar, Vodalian Desecrator, Haunted One, Cauldron of Souls, Deceiver Exarch, Altar of Dementia

Color identity: UB
Mana cost: 
Steps:
  1. Activate Vohar's first ability by tapping it.
  2. Vohar triggers, giving creatures you control that share a creature type with it +2/+0 and undying until end of turn.
  3. Resolve the Vohar ability from step 1, causing you to loot.
  4. Activate Altar of Dementia by sacrificing Deceiver Exarch.
  5. When Deceiver Exarch dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. When Deceiver Exarch enters the battlefield, it triggers, untapping Cauldron of Souls.
  7. Resolve the Altar of Dementia ability from step 4, causing target player to mill cards equal to Deceiver Exarch's power.
  8. Activate Cauldron of Souls by tapping it, giving Deceiver Exarch persist until end of turn.
  9. Activate Altar of Dementia by sacrificing Deceiver Exarch.
  10. When Deceiver Exarch dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  11. When Deceiver Exarch enters the battlefield, it triggers, untapping Vohar.
  12. Resolve the Altar of Dementia ability from step 9, causing target player to mill cards equal to Deceiver Exarch's power.
  13. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite card draw
  - Infinite draw triggers
  - Infinite looting
  - Near-infinite death triggers
  - Near-infinite enters the battlefield
  - Near-infinite leaves the battlefield
  - Near-infinitely powerful Phyrexians, Merfolks and Wizards you control until end of turn
  - Near-infinite mill
  - Near-infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Vohar is your commander and does not have summoning sickness.
  - Deceiver Exarch does not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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