Vizier of Remedies + Heartmender + Yahenni, Undying Partisan

Vizier of Remedies

Heartmender

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing Heartmender.
2. When Heartmender dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Vizier of Remedies.
3. Resolve the Yahenni ability
4. Repeat.

This loop turns Yahenni, Undying Partisan into an infinite recycling engine by exploiting the interaction between persist and replacement effects. When you sacrifice Heartmender to give Yahenni indestructible, Heartmender's persist ability tries to return it with a -1/-1 counter, but Vizier of Remedies steps in to reduce that counter placement to zero. Because Heartmender returns completely clean of any counters, its persist ability will trigger again the next time it dies, letting you sacrifice it over and over to rack up endless death triggers, leaves-the-battlefield triggers, and creature entries.