Beifong's Bounty Hunters + Sek'Kuar, Deathkeeper + Yahenni, Undying Partisan

Beifong's Bounty Hunters

Sek'Kuar, Deathkeeper

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, Sek'Kuar 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 Sek'Kuar trigger, creating a creature token.
8. Resolve the Yahenni ability.
9. Repeat.