Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Pyreheart Wolf + Yahenni, Undying Partisan

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

Pyreheart Wolf

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Pyreheart Wolf
2. When Pyreheart Wolf dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Resolve the Yahenni ability.
4. Activate Yahenni by sacrificing Pyreheart Wolf
5. When Pyreheart Wolf dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
6. Pyreheart Wolf enters and dies as a state-based action due to having 0 toughness. Its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
7. Resolve the Yahenni ability from step 4.
8. Repeat from step 4.