Beifong's Bounty Hunters + Bridge from Below + Yahenni, Undying Partisan

Beifong's Bounty Hunters

Bridge from Below

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, Bridge from Below 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 Bridge from Below trigger, creating a creature token.
8. Resolve the Yahenni ability.
9. Repeat.