Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Flayer of the Hatebound + Yahenni, Undying Partisan

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

Flayer of the Hatebound

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Flayer of the Hatebound
2. When Flayer of the Hatebound dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. When Flayer of the Hatebound enters, it triggers, dealing damage equal to its power to any target.
4. Activate Yahenni by sacrificing Flayer of the Hatebound
5. When Flayer of the Hatebound dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
6. When Flayer of the Hatebound enters, it triggers, dealing damage equal to its power to any target.
7. Resolve both Yahenni abilities from step 1 and 4.
8. Repeat.