Xathrid Necromancer + Arcane Adaptation + Yahenni, Undying Partisan

Xathrid Necromancer

Arcane Adaptation

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing any other creature.
2. When the creature dies as a Human due to Arcane Adaptation, Xathrid Necromancer triggers, creating a 2/2 Zombie creature token.
3. Resolve the Yahenni ability.
4. Repeat.

This clever loop turns Yahenni, Undying Partisan into a self-sustaining sacrifice engine by rewriting the very nature of your creatures with Arcane Adaptation, which is set to Human. Because of that enchantment, every creature you control—including the tokens you make—counts as a Human, ensuring Xathrid Necromancer triggers every single time one of them hits the graveyard. Each sacrifice feeds Xathrid Necromancer to immediately replace your fallen ally with a fresh 2/2 Zombie creature token, which you can then feed back into Yahenni, Undying Partisan to repeat the cycle indefinitely.