Stalwart Successor + Puppeteer Clique + Yahenni, Undying Partisan

Stalwart Successor

Puppeteer Clique

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Puppeteer Clique
2. When Puppeteer Clique dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When Puppeteer Clique enters, it and Stalwart Successor trigger.
4. Resolve the Puppeteer Clique trigger, putting a creature from an opponent's graveyard onto the battlefield under your control.
5. Resolve the Stalwart Successor trigger, putting a +1/+1 counter on Puppeteer Clique
6. Resolve the Yahenni ability.
7. Repeat.