Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Spawning Pit + Propeller Pioneer

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

Spawning Pit

Propeller Pioneer

How it works

1. Activate Spawning Pit by sacrificing Propeller Pioneer.
2. When Propeller Pioneer dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Propeller Pioneer enters, its fabricate ability triggers, putting a +1/+1 counter on it.
4. Resolve the Spawning Pit ability.
5. Repeat.