How can you create a combo with Serrated Biskelion, Thornbite Staff, Thran Vigil, Phyrexian Altar, Geralf's Messenger?
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[START OF COMBO]This combo can be formed with Serrated Biskelion, Thornbite Staff, Thran Vigil, Phyrexian Altar, Geralf's Messenger

Color identity: B
Mana cost: 
Steps:
  1. Activate Serrated Biskelion by tapping it, putting a -1/-1 counter on it and Geralf's Messenger.
  2. Activate Phyrexian Altar by sacrificing Geralf's Messenger, adding one mana of any color.
  3. When Geralf's Messenger dies, its undying ability and Serrated Biskelion trigger.
  4. Resolve the Serrated Biskelion trigger, untapping it.
  5. Resolve the Geralf's Messenger trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. When Geralf's Messenger enters the battlefield, it and Thran Vigil trigger.
  7. Resolve the Geralf's Messenger trigger, causing an opponent to lose 2 life.
  8. Resolve the Thran Vigil trigger, putting a +1/+1 counter on Serrated Biskelion.
  9. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifeloss
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Serrated Biskelion does not have summoning sickness.
  - Thornbite Staff attached to Serrated Biskelion.
  - Geralf's Messenger does not have more than one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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