Heartmender + Mikaeus, the Unhallowed + Phyrexian Altar

WBG identity

Commander legal

The 3 combo pieces

How to execute it

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

What the combo produces