Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Iron League Steed + Phyrexian Altar

WB identity

Commander legal

The 3 combo pieces

How to execute it

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

What the combo produces