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

Color identity: BG
Mana cost: 
Steps:
  1. Activate Altar of Dementia by sacrificing Spike Feeder.
  2. Spike Feeder's undying ability triggers, returning itself to the battlefield with a +1/+1 counter on it.
  3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Spike Feeder's power.
  4. Activate Spike Feeder's second ability three times by removing three +1/+1 counters from it, causing you to gain six life.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers
  - 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
  - Spike Feeder has no +1/+1 counters on it.
[END OF COMBO PREREQUISITES]
assistant