Stalwart Successor + Altar of Dementia

Stalwart Successor

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing the creature with persist.
2. When that creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When that creature enters, Stalwart Successor triggers, putting a +1/+1 counter on it.
4. Remove a +1/+1 and a -1/-1 counter from that creature as a state-based action.
5. Resolve the Altar of Dementia ability.
6. Repeat.