Karmic Guide + Sister Hospitaller + Yahenni, Undying Partisan

Karmic Guide

Sister Hospitaller

Yahenni, Undying Partisan

How it works

1. Cast Karmic Guide by paying 3.
2. When Karmic Guide enters, it triggers, targeting Sister Hospitaller.
3. Holding priority, activate Yahenni by sacrificing Karmic Guide.
4. Resolve the Karmic Guide ability, returning Sister Hospitaller from your graveyard to the battlefield.
5. When Sister Hospitaller enters, it triggers, targeting Karmic Guide.
6. Holding priority, activate Yahenni by sacrificing Sister Hospitaller.
7. Resolve the Sister Hospitaller ability, returning Karmic Guide from your graveyard to the battlefield and causing you to gain 5 life.
8. Repeat from step 2.

This elegant loop harnesses a classic reanimation recursion by trading Sister Hospitaller and Karmic Guide back and forth from the graveyard to the battlefield, constantly triggering their respective entry abilities to revive one another. Meanwhile, Yahenni, Undying Partisan acts as both the sacrificial outlet to feed the loop and an active protector that can instantly grant itself indestructible, turning these recurring resurrections into infinite lifegain and boundless death triggers.