Magic Realms (AKA Elemental Kingdoms) and Lies of Asteroth are two very similar free to play card games. In fact, they use identical game engines but have completely different artwork and cards. If you like card games at all, you owe it to yourself to grab one or both on your Windows Phone. Magic Realms is my personal pick out of the two since it looks a lot nicer IMO.
Magic Realms Clan
We have an official WPCentral clan in Magic Realms. And we're looking for active players to join! You must have unlocked the Clan feature (level 18) and play PvP matches in the Arena daily. PvP points are how a clan increases rank and unlocks new rewards for its members. If that sounds good, hurry up and request to join WPCentral!
Members (not a complete list)