How can you create a combo with Xavier Sal, Infested Captain, Haunted One, Thornbite Staff, Carrion Feeder?
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[START OF COMBO]This combo can be formed with Xavier Sal, Infested Captain, Haunted One, Thornbite Staff, Carrion Feeder

Color identity: BGU
Mana cost: 
Steps:
  1. Activate Xavier Sal's first ability by tapping it and removing a +1/+1 counter from the additional nontoken Human, Fungus and/or Pirate 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 Carrion Feeder by sacrificing the additional Human, Fungus and/or Pirate.
  5. When the creature dies, its undying ability and Xavier Sal trigger.
  6. Resolve the creature's undying trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Resolve the Xavier Sal trigger, untapping it.
  8. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
  9. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite leaves the battlefield
  - Infinite enters the battlefield
  - Infinite sacrifice triggers
  - Infinite death triggers
  - Infinite +1/+1 counters on Carrion Feeder
  - Infinitely powerful Humans, Fungi and Pirates you control until end of turn[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.
  - Thornbite Staff attached to Xavier Sal.
  - You control at least one additional nontoken Human, Fungus and/or Pirate that has no more than one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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