Beifong's Bounty Hunters + Spawning Pit + Scute Swarm

Beifong's Bounty Hunters

Spawning Pit

Scute Swarm

How it works

1. Activate Spawning Pit by sacrificing another nonland creature you control.
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land.
3. Resolve the Spawning Pit ability.
4. Activate Spawning Pit 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, each Scute Swarm triggers, creating that many creature tokens.
7. Resolve the Spawning Pit ability.
8. Repeat.