Woe Strider + Thran Vigil + Gravelgill Axeshark

Woe Strider

Thran Vigil

Gravelgill Axeshark

How it works

1. Activate Woe Strider 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. Thran Vigil triggers, putting a +1/+1 counter on Gravelgill Axeshark.
4. Resolve the Woe Strider ability.
5. Repeat.