First and foremost, the removal of the collection power requirements for ranked battles means that there will no longer be anything preventing players from moving up to higher leagues and tiers if they are able to obtain a high enough rating. If a player is able to win matches and earn a high enough rating to get into a particular league or tier then they will be able to move up even if they have no cards in their collection at all, and no SPS staked.

Sooo... no more leaderboards then? Or is advancing to a higher league still optional?

Also not sure why this is being implemented in the middle of season.