Furystoke Giant + Thran Vigil + Yahenni, Undying Partisan

Furystoke Giant

Thran Vigil

Yahenni, Undying Partisan

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. Thran Vigil triggers, putting a +1/+1 counter on Furystoke Giant.
4. Resolve the Yahenni ability.
5. Repeat.