Beifong's Bounty Hunters + Felidar Retreat + Yahenni, Undying Partisan

Beifong's Bounty Hunters

Felidar Retreat

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, Felidar Retreat triggers, creating a creature token.
7. Resolve the Yahenni ability.
8. Repeat.