Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + Phyrexian Altar + Evernight Shade

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

Phyrexian Altar

Evernight Shade

How it works

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