Magic the Gathering is a global phenomenon that hit in the 90's.
It's a card game where you play the part of a Wizard who duels other wizards.
Your powersource is the lands you command.
They provide you with the Manna or energy to summon creatures and manifest spells.
Originally this was played with cards. You bought them as packs and built up your decks. Like any collecting game it could get rather expensive and as I was throwing all my money at Comic Books back then I wasn't in a position to throw them at Magic Cards as well.
For 800 MS points this is great value for money. The game is a virtual card game that allows you to expand and aquire more cards and decks and provides for a reasonable amount of customisation as well.
It can seem a bit daunting and confusing at first because the game does have a fair amount of depth but this year's edition comes with the best tutorial system they've released yet. It talks you through an entire match gives you all the basics to set you on your merry way.
If you had 2012 you are rewarded with a bonus deck which I thought was a nice acknowledgement on the part of the developers to existing fans.
Stronly recommend checking this out.
On your first go you may not find it an instant hit but there's a reason the franchise is so massive and it doesn't take too many games to understand the appeal.