Urban Rivals is the best free massive multi player online (MMO) collectible card game (CCG) I have ever found. Plus, you do not need to download anything to play! You can play from work, from school, from a friends house, all you need is the internet!
Years after I found Urban Rivals, I still play when I find time. I have collected 90% of the cards, which are hilarious by the way, and I still enjoying playing the players. The game is a great mix of strategy and skill, sometimes there is even a little luck thrown in.
It is free to play. You can spend money to buy extra packs, but I only spent a few bucks when I started and have managed to build the rest of my collection by getting my friends to join.
You can use this link to register quickly:
It will automatically make me you sponsor and I'll help you progress
In fact, anyone that registers a new account and sends me an e-mail I will send you a free rare card! Just send me a message once you've joined.
You can check my profile here:
Click here if you want to look at the characters: