Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phyrexian Altar + Witch-king, Sky Scourge

RWB identity

Commander legal

The 3 combo pieces

How to execute it

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

What the combo produces