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

Color identity: BG
Mana cost: 
Steps:
  1. Activate Phyrexian Altar by sacrificing Defiant Greatmaw, adding one mana of any color.
  2. When Defiant Greatmaw dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. When Defiant Greatmaw enters the battlefield, its first ability triggers, putting two -1/-1 counters on it.
  4. Defiant Greatmaw's second ability triggers, removing a -1/-1 counter from another creature you control.
  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
  - Defiant Greatmaw does not have a +1/+1 counter on it.
[END OF COMBO PREREQUISITES]
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