I haven't been paying attention so this is the first I'm seeing about this, but colour me intrigued...
This is going to sound super pedantic, and maybe you have a reason for doing it, but when you mention pricing you use per "deck" of cards when I think you should use "pack" or something similar. A deck of cards is a selection of cards from your whole collection, a pack of is used to fill your collection. Like I said, super pedantic, and I know it's a silly thing to point out and has no bearing on the game you are making, but, hey, pedants gonna pedant.
I'm trying to teach myself how to make a game right now and one of the things I'd eventually like to learn is how to make something like a CCG so I'm gonna be keeping an eye on this to see how things turn out.
lets start a steem-monsters clan o_o
Sounds like a plan, haha.