Dread Tiller + Mikaeus, the Unhallowed + Phyrexian Altar

BG identity

Commander legal

The 3 combo pieces

How to execute it

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

What the combo produces