Viscera Seer + Lesser Masticore + Serra Redeemer

Viscera Seer

Lesser Masticore

Serra Redeemer

How it works

1. Activate Viscera Seer by sacrificing Lesser Masticore
2. When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Lesser Masticore enters, Serra Redeemer triggers, putting a +1/+1 counter on Lesser Masticore
4. Resolve the Viscera Seer ability.
5. Repeat.