Altar of Dementia + Scuzzback Marauders + Hardened Academic

Altar of Dementia

Scuzzback Marauders

Hardened Academic

How it works

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