Beifong's Bounty Hunters, Grimgrin, Corpse-Born, and M'Ress, Crew Coordinator

Prerequisites

• Beifong's Bounty Hunters on the battlefield
• Grimgrin, Corpse-Born on the battlefield
• M'Ress, Crew Coordinator on the battlefield

Steps

1. Activate Grimgrin by sacrificing another nonland creature you control When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land
2. Resolve the Grimgrin ability, untapping it and putting a +1/+1 counter on it
3. Activate Grimgrin by sacrificing the land When the land dies, Beifong's Bounty Hunters triggers, returning the land from your graveyard to the battlefield tapped
4. When the land enters, M'Ress triggers, creating two 1/1 red Officer creature tokens Resolve the Grimgrin ability, untapping it and putting a +1/+1 counter on it
5. 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