Dominion Saboteur + Umbral Collar Zealot

Dominion Saboteur

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot by sacrificing Dominion Saboteur.
2. When Dominion Saboteur dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it. Choose to have it enter as a copy of the creature with persist with a +1/+1 counter on it.
3. Remove a +1/+1 counter and a -1/-1 counter from Dominion Saboteur as a state-based action.
4. Resolve the Umbral Collar Zealot ability.
5. Repeat.