Magic: The Gathering has changed away from the old Magic rating, which could go up or down depending on who you play, to Planeswalker Points. The biggest change here is that the more you play the more points you’ll have.
Sadly, since the policy change on who can run events (stores only) LXG no longer has sanctioned events, but for those who played in the Grand Melee league in 2009 and 2010, your matches and points will be up there.
Here’s a link to Planeswalker Points. Of course you know your DCI number don’t you?