I've been playing this game a lot now, and i recommend it to anyway who likes or may have an interest in trading card games. There is some decent strategy involved and the multiplayer is great and has a ranking system It's free to download and runs fine on my HTC desire HD.
You can play it on your web browser too, which is a nice option. I'm hoping more of these type of games come to the Android market as this one is very well done.
Shadow Era Trading Card Game - Free TCG for iPhone, Android and Web