Woe Strider + Lingering Tormentor + Hardened Academic

Woe Strider

Lingering Tormentor

Hardened Academic

How it works

1. Activate Woe Strider by sacrificing Lingering Tormentor.
2. When Lingering Tormentor 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 Lingering Tormentor.
4. Resolve the Woe Strider ability.
5. Repeat.