Since many of us returning from long breaks are not familiar with this mini-game, and how it interacts with (benefits?) EQ/EQ2 gameplay, I thought I'd start a thread.
I've barely scratched the surface of the system, and with Nephyrs help was able to redeem a bunch of 'free' card decks last night. I ended up with some kind of dual headed hydra mount and a nimbus on Raz, and got a 2hs ornamentation that includes a DD proc on my alt account (which is really a bummer, since I have no melee characters on that account.
I'll contribute with some links.
The Legends of Norrath main website
http://legendsofnorrath.station.sony.com/Links on the left to the FAQ, instructions on how to play the game, etc... are on the left. Also, you can look through the loot cards for the different booster decks via the menu on the left. This should help you decide which set you want to choose to redeem your decks from.
Anyway, maybe some of you folks who are more familiar with the game, and the cards... how to get them, trade them, etc... could provide some insight...