Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Spawning Pit + Accomplished Automaton

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

Spawning Pit

Accomplished Automaton

How it works

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