Woe Strider + Thran Vigil + Grazing Kelpie

Woe Strider

Thran Vigil

Grazing Kelpie

How it works

1. Activate Woe Strider by sacrificing Grazing Kelpie.
2. When Grazing Kelpie 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 Grazing Kelpie.
4. Resolve the Woe Strider ability.
5. Repeat.