Shadow Era is a Yet Another Collectable Card Game. They did it on Unity and ported it everywhere, where unity runs, in-browser, iPhone, Android, PC, Mac, Linux, the last three are out-of-browser builds. You have an account and you are playing the same game no matter what client you are using to log in.
Now, I personally did not play this game a lot, just a few days, and it does look interesting. It's based on the games such as MtG or WoW TCG (closer to the latter), but it's much simpler (a disadvantage for hardcore MtG fan).
A friend of mine has been enjoying this game for many-many months now. He is a former MtG player. When I asked him what he likes it for he said:
- Very good balance. No obvious winning combinations.
- A lot of players to play with, never have to wait for a match
- Does not require huge investments of real world money. The basic game is free, you get a starter pack. After experimenting with it a bit, playing against AI, other players and reading forums he figured what a decent deck might be. He spent a small amount of money to get some boosters that helped him to get a decent deck. After he started beating people he never needed to spend real world money again, all his purchasing needs was covered from whatever he got from winning matches against people.
- Since it runs from a phone and a match is not usually long it's convenient to play anywhere, while waiting, etc
Currently the game has first set of 200 cards that is finalized. (I.e. balanced enough that the devs are not planning on making any further changes), but there will be new cards in the future too.
As a curiosity, I'd also like to point out, that they over-funded the physical cards project for this game. I personally see no value in playing this games with real cards when you can do it online, but others obviously (see at the funding results) disagree
http://www.wulven.com/cards.php