User blog comment:Chad Pattan/Dear Nubee: It's Time To Clean Up The Cards./@comment-24927152-20150613005840/@comment-24927152-20150619182804

Sounds like they're starting to follow Brave Frontier in that re-run each event for cards without anything changing. (Challenge-wise.) Elemental hall is an improvement in my opinion, but the fact that you can't get the archwitch from it, and only "Rikayu in Chains" makes it useless except for subjugation points and awakening items.