Board Thread:Questions and Answers/@comment-27917177-20160305012242/@comment-28498921-20160604063116

When you open them, which arena you are in matters. So even if you climbed all your way up to a new arena with nine crowns, if you get the tenth crown and get demoted to your previous arena, you only get cards from that arena and below. In short you must open them in an arena as new as possible.