Beifong's Bounty Hunters + Totentanz, Swarm Piper + Yahenni, Undying Partisan

Beifong's Bounty Hunters

Totentanz, Swarm Piper

Yahenni, Undying Partisan

How it works

1. Activate Yahenni by sacrificing another nonland creature.
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land you control.
3. Resolve the Yahenni ability.
4. Activate Yahenni by sacrificing the earthbent land.
5. When the land dies, Totentanz and Beifong's Bounty Hunters trigger.
6. Resolve the Beifong's Bounty Hunters trigger, returning the land from your graveyard to the battlefield.
7. Resolve the Totentanz trigger, creating a creature token.
8. Resolve the Yahenni ability.
9. Repeat.

This looping engine turns Yahenni, Undying Partisan into a relentless sacrifice outlet that feeds on its own environment. By sacrificing a creature, you trigger Beifong's Bounty Hunters to animate and grow one of your lands through earthbending, which you can then sacrifice right back to Yahenni. When that land hits the graveyard, Totentanz, Swarm Piper steps in to generate a fresh Rat token alongside the land's own return-to-the-battlefield clause, creating a self-sustaining cycle of death and rebirth that racks up infinite triggers.