Cass, Hand of Vengeance + Ajani's Chosen + Yahenni, Undying Partisan

Cass, Hand of Vengeance

Ajani's Chosen

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing another creature that has an Aura attached to it.
2. When the creature dies, Cass triggers, returning an Aura that was attached to the creature from your graveyard to the battlefield attached to another creature you control.
3. When the Aura enters the battlefield, Ajani's Chosen triggers, creating a creature token.
4. Resolve the Yahenni ability.
5. Repeat.

This clever loop spins up an endless engine of sacrifice and resurrection by letting Cass, Hand of Vengeance recycle an Aura every time a creature meets its end. By feeding a creature into Yahenni, Undying Partisan's sacrifice ability, you trigger Cass to pull that attached Aura straight out of the graveyard and return it to the battlefield. The moment that Aura re-enters, Ajani's Chosen leaps into action to generate a fresh Cat token, which promptly becomes the new target ready to receive the recycled Aura and keep the cycle going.