Furystoke Giant + Yahenni, Undying Partisan + Hardened Academic

Furystoke Giant

Yahenni, Undying Partisan

Hardened Academic

How it works

1. Activate Yahenni by sacrificing Furystoke Giant.
2. When Furystoke Giant 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 Furystoke Giant.
4. Resolve the Yahenni ability.
5. Repeat.