Retreat to Coralhelm, Skyshroud Ranger, and Oboro, Palace in the Clouds

Prerequisites

• Retreat to Coralhelm on the battlefield
• Skyshroud Ranger on the battlefield
• Oboro, Palace in the Clouds in hand
• Skyshroud Ranger does not have summoning sickness

Steps

1. Activate Skyshroud Ranger by tapping it, putting Oboro from your hand onto the battlefield
2. Oboro enters the battlefield, triggering Retreat to Coralhelm, untapping Skyshroud Ranger
3. Activate Oboro's first ability by tapping it, adding
4. Activate Oboro's second ability by paying , returning it from the battlefield to your hand
5. Repeat

Results

• Infinite landfall triggers