You can manage & track your card collection and decks once you create an account and login.
ATP Mode will hide all non-WotC content, while also making ATP content visible. This is very site-encompassing, and includes card lists, decks, tournaments, even the Card of the Day.
For months now I've been messages (primarily from ATP users) requesting the ability to hide non-ATP/WotC content. While it sounds easy enough thing to do, it required "a lot" of site re-working and is something I've been working on for a while now. Not only should this make it easier for ATP users, but it also makes it cleaner for non-ATP users as well.
Most active ATP users should have ATP Mode activated already. The logic was "any one who has created/edited a deck with ATP cards since May 1st" should have it enabled. If I missed you, enabling it is easy! Just go to your Account
page, scroll down, and click "Enable ATP Mode".
If you have any questions, or found something I missed*, please let me know!
*I know the Consolidated Stats page for tournaments shows all groups. That'll get fixed eventually(tm).