Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Hound of Griselbrand + Yahenni, Undying Partisan

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

Hound of Griselbrand

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Hound of Griselbrand
2. When Hound of Griselbrand dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Activate Yahenni by sacrificing Hound of Griselbrand
4. When Hound of Griselbrand dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Resolve both Yahenni abilities from step 1 and 3.
6. Repeat.