Beifong's Bounty Hunters + Retreat to Emeria + Yahenni, Undying Partisan

Beifong's Bounty Hunters

Retreat to Emeria

Yahenni, Undying Partisan

How it works

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