How can you create a combo with Mikaeus, the Unhallowed, Hex Parasite, Ashnod's Altar, Gray Merchant of Asphodel?
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[START OF COMBO]This combo can be formed with Mikaeus, the Unhallowed, Hex Parasite, Ashnod's Altar, Gray Merchant of Asphodel

Color identity: B
Mana cost: 
Steps:
  1. Activate Ashnod's Altar by sacrificing Gray Merchant, adding {C}{C}.
  2. Gray Merchant dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. Gray Merchant enters the battlefield, causing each opponent to lose at least five life and you to gain that much life.
  4. Activate Hex Parasite by paying {1} and two life, removing the +1/+1 counter from Gray Merchant and giving Hex Parasite +1/+0 until end of turn.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - Infinite lifeloss
  - Infinite leaves the battlefield
  - Infinitely powerful Hex Parasite until end of turn
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Gray Merchant does not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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