Galadriel of Lothlórien + Retreat to Coralhelm + Penance + Arid Archway

Galadriel of Lothlórien

Retreat to Coralhelm

Penance

Arid Archway

How it works

1. Play Arid Archway.
2. When Arid Archway enters the battlefield, it and Retreat to Coralhelm trigger.
3. Resolve the Arid Archway trigger, returning it from the battlefield to your hand.
4. Holding priority, activate Penance by putting Arid Archway from your hand onto the top of your library.
5. Resolve the Retreat to Coralhelm trigger, causing you to scry 1, ensuring to leave Arid Archway on top of your library.
6. Galadriel triggers, putting Arid Archway from the top of your library onto the battlefield tapped.
7. Repeat from step 2.