Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Altar of Dementia + Strangleroot Geist

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

Altar of Dementia

Strangleroot Geist

How it works

1. Activate Altar of Dementia by sacrificing Strangleroot Geist
2. When Strangleroot Geist dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. Resolve the Altar of Dementia ability.
4. Activate Altar of Dementia by sacrificing Strangleroot Geist
5. When Strangleroot Geist dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
6. Strangleroot Geist 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 Altar of Dementia ability from step 4.
8. Repeat from step 4.