Think of it as if you were to just by the pre-made themed decks and just play those.
You can swap out cards in decks, but I don't recall being able to make an entirely custom deck.
Considering you can get this with all the DLC once a year for less than the price of two pre-made themed decks of the physical cards, it's a good deal even if you only play it a few times. There is a single player campaign and you can play multiplayer or coop.
This comment was edited on May 24, 2013, 05:32.