I've been playing a fair bit of this Might and Magic themed CCG for a while now, and I have to say it is truly excellent. If you are interested in these kinds of games give it a look see. I've provided a link below, which of course benefits me to a degree.
However, the real benefit from joining from another players link is that you start automatically with all 6 starter decks. There is no reason not to join as a friend, and if you join and never play, I don't get anything from it anyway
I've also got some additional information here:
Anyway, if you like CCGs this one has me totally hooked, and like I said above, you MUST join with someones link as otherwise you are starting at a severe disadvantage card wise.