How can you create a combo with Mikaeus, the Unhallowed, Cryptic Trilobite, Altar of Dementia?
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[START OF COMBO]This combo can be formed with Mikaeus, the Unhallowed, Cryptic Trilobite, Altar of Dementia

Color identity: B
Mana cost: 
Steps:
  1. If Cryptic Trilobite has any +1/+1 counters, activate Cryptic Trilobite's first activated ability until it has no +1/+1 counters, adding {C}{C} that can only be spent to activate abilities each time.
  2. Activate Altar of Dementia by sacrificing Cryptic Trilobite.
  3. Cryptic Trilobite's undying ability from Mikaeus triggers, returning Cryptic Trilobite from your graveyard to the battlefield with a +1/+1 counter on it.
  4. Repeat any number of times.
  5. Resolve all Altar of Dementia abilities, milling any number of players any number of cards.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana that can only be spent on activated abilities
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
[END OF COMBO PREREQUISITES]
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