Mikaeus, the Unhallowed + Phyrexian Altar + Plague Belcher

B identity

Commander legal

The 3 combo pieces

How to execute it

  1. Activate Phyrexian Altar by sacrificing Plague Belcher.
  2. When Plague Belcher dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. When Plague Belcher enters the battlefield, it triggers, putting a -1/-1 counter on it
  4. Repeat.

What the combo produces