Safehold Elite + Yahenni, Undying Partisan + Hardened Academic

Safehold Elite

Yahenni, Undying Partisan

Hardened Academic

How it works

1. Activate Yahenni by sacrificing Safehold Elite.
2. When Safehold Elite 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 Safehold Elite.
4. Resolve the Yahenni ability.
5. Repeat.