I got this on xbox live, and its a pretty sweet game.
Even though I already got it on the xbox, and the first expansion on top, I might get it on steam, so I can play with a friend of mine as well.
As for the physical card game itself, I know my older brother got a random starter pack (a 2005 one I think?), from our grandmother, and that had two decks in it, so if I ever wanted to take up the game, I'm sure my older brother would let me have it. (He doesn't care for card games...).
I may even have to search for that older game, so I can simulate making decks before I set out and do it.
My favourite deck has to be Ears of the Elves.
What I loved about the expansion was that I played an ai in the campaign, that had a deck which had hardly any monsters in at all.
It was mostly focused on removing the cards from my deck, limiting my options for a counter when they play a strong monster.
(Fortunately I had saved up a monster destroy card to eliminate that monster, and the EOTE deck is great a building up a strong squad pretty quickly (abilities that boost stats, and get more cards in play))