Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Mighty Mutanimals + Yahenni, Undying Partisan

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

Mighty Mutanimals

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing another nontoken creature that doesn't have a -1/-1 counter on it.
2. When the creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When the creature enters, Mighty Mutanimals triggers, putting a +1/+1 counter on the creature.
4. Resolve the Yahenni ability.
5. Repeat.