Stalwart Successor + Altar of Dementia + Obstinate Gargoyle

Stalwart Successor

Altar of Dementia

Obstinate Gargoyle

How it works

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