Baloth Prime + Beifong's Bounty Hunters + Yahenni, Undying Partisan

Baloth Prime

Beifong's Bounty Hunters

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 you control.
3. Resolve the Yahenni ability.
4. Activate Yahenni by sacrificing the earthbent land.
5. When the land dies, it and Baloth Prime trigger.
6. Resolve the land's trigger, returning it from your graveyard to the battlefield tapped.
7. Resolve the Baloth Prime trigger, untapping it and creating a tapped 4/4 Beast creature token.
8. Resolve the Yahenni ability.
9. Repeat.