Lesser Masticore + Yahenni, Undying Partisan + Hardened Academic

Lesser Masticore

Yahenni, Undying Partisan

Hardened Academic

How it works

1. Activate Yahenni by sacrificing Lesser Masticore.
2. When Lesser Masticore 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 Lesser Masticore.
4. Resolve the Yahenni ability.
5. Repeat.