DotP is sort of Magic-Lite — you can play against the computer or other humans online using pre-constructed decks. However, you can’t build your own decks from scratch (you can customize them by choosing whether or not to include the new cards you can unlock for each deck by playing through the campaign mode). As I said in the original review, it’s a fun Magic diversion and worth the low price ($9.99 on Steam). Plus, if you order it now you’ll get the first expansion for free when it’s released. I’m not sure how long that offer is good for.
I had a chance to play an earlier build of the game a few days ago, and it’s basically identical to the Xbox version. There are more graphics options, so you can adjust things to suit your PC’s performance. They’ve also fixed some of the issues I had with the original game. The biggest fix, in my mind, is that large stacks of land now have numbers on them so you can see how many are there. Before, it was nearly impossible to count a pile of land to see how much mana you or your opponent had available.