How can you create a combo with Carnifex Demon, Nest of Scarabs, Blowfly Infestation, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Carnifex Demon, Nest of Scarabs, Blowfly Infestation, Phyrexian Altar

Color identity: B
Mana cost: {B}
Steps:
  1. Acftivate Carnifex Demon by paying {B} and removing a -1/-1 counter from it, putting a -1/-1 counter on each other creature.
  2. Nest of Scarabs triggers for each counter placed this way, creating at least one 1/1 Insect creature token.
  3. If any creatures died as a result of the counters being placed, Blowfly Infestation also triggered once for each death, putting a -1/-1 counter on Carnifex Demon and all remaining counters onto any other creature(s).
  4. Activate Phyrexian Altar by sacrificing an Insect, adding {B}.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite -1/-1 counters on all other creatures
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Carnifex Demon has at least two -1/-1 counters on it.
  - At least two additional creatures on the battlefield.
[END OF COMBO PREREQUISITES]
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