Beifong's Bounty Hunters, Grimgrin, Corpse-Born, and Retreat to Emeria

Prerequisites

• Beifong's Bounty Hunters on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• Retreat to Emeria on the battlefield

Steps

1. Activate Grimgrin by sacrificing another nonland creature you control
2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land
3. Resolve the Grimgrin ability
4. Activate Grimgrin 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, Retreat to Emeria triggers, creating a creature token
7. Resolve the Grimgrin ability
8. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers