Rotlung Reanimator + Xenograft + Yahenni, Undying Partisan

Rotlung Reanimator

Xenograft

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing any other creature.
2. When the creature dies as a Cleric due to Xenograft, Rotlung Reanimator triggers, creating a 2/2 Zombie creature token.
3. Resolve the Yahenni ability.
4. Repeat.

This brilliant loop turns Yahenni, Undying Partisan into an endless sacrifice engine by reshaping the very nature of your creature base. With Xenograft on the battlefield naming "Cleric," every single creature you control—including the token bodies you generate—gains that type in addition to its others, perfectly priming the room for Rotlung Reanimator's trigger whenever anything passes away. By feeding any creature to Yahenni's sacrifice ability, Rotlung Reanimator immediately replaces it with a fresh 2/2 Zombie token, which itself enters as a Cleric ready to be fed back into the engine for infinite death triggers, enters-the-battlefield events, and leaves-the-battlefield value.