How can you create a combo with Zellix, Sanity Flayer, Haunted One, Pith Driller, Phyrexian Altar, Faces of the Past?
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[START OF COMBO]This combo can be formed with Zellix, Sanity Flayer, Haunted One, Pith Driller, Phyrexian Altar, Faces of the Past

Color identity: UB
Mana cost: {1}
Steps:
  1. Activate Zellix by paying {1} and tapping it.
  2. Haunted One triggers, causing all Horrors you control to get +2/+0 and undying until end of turn.
  3. Resolve the Zellix ability, causing a player to mill three cards.
  4. If the player milled a creature card this way, Zellix triggers, creating a 1/1 Horror creature token.
  5. Activate Phyrexian Altar by sacrificing Pith Driller, adding {1}.
  6. When Pith Driller dies, its undying ability and Faces of the Past trigger.
  7. Resolve the Pith Driller trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  8. When Pith Driller enters the battlefield, it triggers, putting a -1/-1 counter on it.
  9. Resolve the Faces of the Past trigger, untapping all Horrors.
  10. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinitely powerful Horrors you control until end of turn except Pith Driller
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill
  - Infinite untap of all Horrors
  - Near-infinite colored mana
  - Near-infinite creature tokens[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Zellix does not have summoning sickness.
  - Pith Driller does not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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