Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Spawning Pit + Sightless Ghoul

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

Spawning Pit

Sightless Ghoul

How it works

1. Activate Spawning Pit by sacrificing Sightless Ghoul
2. When Sightless Ghoul dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Activate Spawning Pit by sacrificing Sightless Ghoul
4. When Sightless Ghoul dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Resolve both Spawning Pit abilities from step 1 and 3.
6. Repeat.