Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Carrion Feeder + Witch-king, Sky Scourge

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Carrion Feeder

Witch-king, Sky Scourge

How it works

1. Activate Carrion Feeder 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 Carrion Feeder 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. Resolve both Carrion Feeder abilities from step 1 and 3.
6. Repeat.

This elegant loop relies on the constant rebirth of Witch-king, Sky Scourge to feed the relentless appetite of Carrion Feeder. While Carrion Feeder grows with infinite +1/+1 counters by sacrificing the Witch-king over and over, the secret engine that keeps the cycle spinning is Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight; its back face grants persist to your nontoken creatures, neatly alternating with the Witch-king's own innate undying ability to bypass counter-lock. Because the Witch-king continually returns with either a +1/-1 counter or a -1/-1 counter that immediately annihilate each other due to state-based actions, it can be sacrificed indefinitely to generate endless death triggers, leaving you with an astronomically large Carrion Feeder.