Retreat to Coralhelm + Sakura-Tribe Scout + Guildless Commons

Retreat to Coralhelm
Sakura-Tribe Scout
Guildless Commons

Requires
Guildless Commons in hand. All other permanents on the battlefield. Sakura-Tribe Scout does not have summoning sickness.
Steps
  1. Activate Sakura-Tribe Scout by tapping it, putting Guildless Commons from your hand onto the battlefield
  2. Guildless Commons enters the battlefield, triggering itself and Retreat to Coralhelm
  3. Resolve the Guildless Commons trigger, returning itself from the battlefield to your hand
  4. Resolve the Retreat to Coralhelm trigger, untapping Sakura-Tribe Scout
  5. Repeat
Results
Infinite landfall triggers.