There are currently 17800 registered users. You can browse the complete list here.
This is their distribution by countries and by games. You can sort the list by country, by game, or by number of users by clicking on the header of the corresponding column.
If you think your country or your game is scoring too low, you can help by spreading the word about this site among your friends.
To get a list of the players of collectible cards in a specific country, or for a specific game, just click on the country's or game's name.