Umbral Collar Zealot + Thran Vigil + Scuzzback Marauders

Umbral Collar Zealot

Thran Vigil

Scuzzback Marauders

How it works

1. Activate Umbral Collar Zealot by sacrificing Scuzzback Marauders.
2. When Scuzzback Marauders 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 Scuzzback Marauders.
4. Resolve the Umbral Collar Zealot ability.
5. Repeat.