Thanks for setting this up. I actually had initially created my own "collection" posts for some series I was writing, but this interface makes it much more functional!
Here's the collection/series I'm currently working on for Splinterlands card buying:
https://peakd.com/hive-110144/@iviaxpow3r/the-newbs-guide-to-buying-cards-in-splinterlands-series-collection-qta7ab#comments