Baloth Prime + Beifong's Bounty Hunters + Altar of Dementia

Baloth Prime

Beifong's Bounty Hunters

Altar of Dementia

How it works

1. Activate Altar of Dementia 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 Altar of Dementia ability.
4. Activate Altar of Dementia 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 Altar of Dementia ability.
9. Repeat.