Lesser Masticore + Carrion Feeder + Mm'menon, Uthros Exile

Lesser Masticore

Carrion Feeder

Mm'menon, Uthros Exile

How it works

1. Activate Carrion Feeder 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, Mm'menon triggers, putting a +1/+1 counter on Lesser Masticore.
4. Resolve the Carrion Feeder ability.
5. Repeat.

This loop turns the recursive nature of Lesser Masticore into an engine of endless growth by utilizing Carrion Feeder as a zero-mana outlet to send the Masticore to the graveyard. Because Lesser Masticore is an artifact, its return triggers Mm'menon, Uthros Exile to place a +1/+1 counter on it; state-based actions then cause this +1/+1 counter and the persist ability's -1/-1 counter to annihilate each other, leaving the Masticore completely clean and ready to be sacrificed all over again.