Baloth Prime + Beifong's Bounty Hunters + Umbral Collar Zealot

Baloth Prime

Beifong's Bounty Hunters

Umbral Collar Zealot

How it works

1. Activate Umbral Collar Zealot 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 Umbral Collar Zealot ability.
4. Activate Umbral Collar Zealot 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 Umbral Collar Zealot ability.
9. Repeat.