Retreat to Coralhelm, Skyshroud Ranger, and Golgari Rot Farm

Prerequisites

• Retreat to Coralhelm on the battlefield
• Skyshroud Ranger on the battlefield
• Golgari Rot Farm in hand
• Skyshroud Ranger does not have summoning sickness

Steps

1. Activate Skyshroud Ranger by tapping it, putting Golgari Rot Farm from your hand onto the battlefield
2. Golgari Rot Farm enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Golgari Rot Farm trigger, returning itself from the battlefield to your hand
4. Resolve the Retreat to Coralhelm trigger, untapping Skyshroud Ranger
5. Repeat

Results

• Infinite landfall triggers