Mikaeus, the Unhallowed + Defiant Greatmaw + Ashnod's Altar

Mikaeus, the Unhallowed
Defiant Greatmaw
Ashnod's Altar

Requires
Mikaeus, the Unhallowed must be on the battlefield. Defiant Greatmaw must be on the battlefield. Ashnod's Altar must be on the battlefield. Defiant Greatmaw does not have a +1/+1 counter on it.
Steps
  1. Activate Ashnod's Altar by sacrificing Defiant Greatmaw, adding
  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.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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