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

Color identity: B
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Soulstinger, adding one mana of any color.
  2. When Soulstinger dies, its second and undying abilities trigger.
  3. Resolve the first trigger, allowing you to put a number of -1/-1 counters on a creature equal to the number that were on Soulstinger.
  4. Resolve the undying trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  5. When Soulstinger enters the battlefield, its first ability triggers, putting two -1/-1 counters on it.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite -1/-1 counters
  - 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
  - Soulstinger does not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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