Altar of Dementia + Thran Vigil + Safehold Elite

Altar of Dementia

Thran Vigil

Safehold Elite

How it works

1. Activate Altar of Dementia by sacrificing Safehold Elite.
2. When Safehold Elite dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Thran Vigil triggers, putting a +1/+1 counter on Safehold Elite.
4. Resolve the Altar of Dementia ability.
5. Repeat.