Stalwart Successor + Gravelgill Axeshark + Yahenni, Undying Partisan

Stalwart Successor

Gravelgill Axeshark

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Gravelgill Axeshark
2. When Gravelgill Axeshark dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Gravelgill Axeshark enters, Stalwart Successor triggers, putting a +1/+1 counter on Gravelgill Axeshark
4. Resolve the Yahenni ability.
5. Repeat.