Scouring Swarm, Beifong's Bounty Hunters, and Ashnod's Altar

Prerequisites

• Scouring Swarm on the battlefield
• Beifong's Bounty Hunters on the battlefield
• Ashnod's Altar on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing another nonland creature you control
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land you control
3. Activate Ashnod's Altar by sacrificing the earthbent land
4. When the land dies, it and Scouring Swarm trigger
5. Resolve the land's trigger, returning it from your graveyard to the battlefield tapped
6. Resolve the Scouring Swarm trigger, untapping it and creating a creature token
7. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite colorless mana
• Infinite creature tokens
• Infinite landfall triggers