Stalwart Successor + Altar of Dementia + Safehold Elite

Stalwart Successor

Altar of Dementia

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. When Safehold Elite enters, Stalwart Successor triggers, putting a +1/+1 counter on Safehold Elite
4. Resolve the Altar of Dementia ability.
5. Repeat.