How can you create a combo with Mikaeus, the Unhallowed, Crystalline Crawler, Phyrexian Altar?
user
[START OF COMBO]This combo can be formed with Mikaeus, the Unhallowed, Crystalline Crawler, Phyrexian Altar

Color identity: B
Mana cost: 
Steps:
  1. If Crystalline Crawler has a +1/+1 counter on it, activate its first ability by removing a +1/+1 counter from it, adding one mana of any color.
  2. Repeat step 1 until Crystalline Crawler has no +1/+1 counters on it.
  3. Activate Phyrexian Altar by sacrificing Crystalline Crawler, adding one mana of any color.
  4. Crystalline Crawler dies, triggering its undying ability, returning it to the battlefield with a +1/+1 counter on it.
  5. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - 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
[END OF COMBO PREREQUISITES]
assistant