Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Grimgrin, Corpse-Born + Peema Outrider

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

Grimgrin, Corpse-Born

Peema Outrider

How it works

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