Ok so thinking about buying this game on steam PC. Found this link http://www.gamefaqs.com/ps3/671862-magic-the-gathering-duels-of-the-planeswalkers/cheats

There are some codes there to unlock cards. What I am wondering is if I can use these codes right away without removing any gameplay elements?

As I understand it, in this game you battle the AI to unlock cards. I don't want to have anything unlocked by using a code if I can get the cards by just playing. But the cards in the link is not possible to get in any way other then the codes right? Just want to doublecheck.

Yeah and also, if I unlock these cards right away will single player mode become to easy you think? Maybe it is best to not use the codes until I go into multiplayer?