Stalwart Successor + Scuzzback Marauders + Yahenni, Undying Partisan

Stalwart Successor

Scuzzback Marauders

Yahenni, Undying Partisan

How it works

1. Activate Yahenni 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. When Scuzzback Marauders enters, Stalwart Successor triggers, putting a +1/+1 counter on Scuzzback Marauders
4. Resolve the Yahenni ability.
5. Repeat.

This clever loop turns your graveyard into a revolving door by leveraging the interplay between persist and counter-placement. When you use Yahenni, Undying Partisan to sacrifice Scuzzback Marauders, the Marauders return via persist with a -1/-1 counter, which immediately triggers Stalwart Successor to drop a +1/+1 counter on it; these two counters instantly annihilate each other as a state-based action, leaving the Marauders fresh and ready to be sacrificed all over again. Meanwhile, Yahenni feeds endlessly on the resulting death triggers, growing into a massive threat while keeping itself safe with its own built-in protection.