Retreat to Coralhelm, Skyshroud Ranger, and Azorius Chancery

Prerequisites

• Retreat to Coralhelm on the battlefield
• Skyshroud Ranger on the battlefield
• Azorius Chancery in hand
• Skyshroud Ranger does not have summoning sickness

Steps

1. Activate Skyshroud Ranger by tapping it, putting Azorius Chancery from your hand onto the battlefield
2. Azorius Chancery enters the battlefield, triggering itself and Retreat to Coralhelm
3. Resolve the Azorius Chancery 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