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

Color identity: B
Mana cost: 
Steps:
  1. Activate Serrated Biskelion by tapping it, putting a -1/-1 counter on it and Butcher Ghoul.
  2. Activate Phyrexian Altar by sacrificing Butcher Ghoul, adding one mana of any color.
  3. When Butcher Ghoul dies, its undying ability and Serrated Biskelion trigger.
  4. Resolve the Serrated Biskelion trigger, untapping it.
  5. Resolve the Butcher Ghoul trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. When Butcher Ghoul leaves your graveyard, Thran Vigil triggers, putting a +1/+1 counter on Serrated Biskelion.
  7. 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.
  - Butcher Ghoul does not have more than one +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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