Suggestion: Set missing packs
AZ1 pack is listed under Set filter dropdown, but some others like Tranquil Dream Pack is missing(the cards in the browser are listed correctly under this set). If you could periodically query across all cards to generate the list in the dropdown and cache it, then it'd stay up to date more consistently.
Re: Suggestion: Set missing packs
Those are listed under Dungeon Packs. I'll do a breakdown of them in the near future.