Cards like Queen Brahne, Red Mages Rapier and Sidequest: Play Blitzball can generate big rewards if you are able to get through, which makes the keywords from Coral Sword and Item Shopkeep very valuable
And, I also know that my wife had staked out this store the day before where several people had been waiting, expecting a restock
However, the equipped creature will have indestructible before state-based actions are checked, so it won't be destroyed even if that damage would ordinarily be lethal
While on the battlefield, a Room's characteristics are a combination of the characteristics of its unlocked doors
If people are curious, I can also do a dedicated comparison post showing light reflection, edge behavior, and thickness side-by-side Hope this helps :) Note: as an Amazon Associate, I earn from qualifying purchases