Your comments

I thought that the twelfth win earns you a lot of gold not 50

This idea if you put it with this will be very easy to collect gold. http://wilds.userecho.com/topics/3428-the-challenges/ ;D

Rez also tries to put classes and symbols for each class

Another idea might be to make "special challenge events" where with 12 wins you can win more than 3,000 gold.

I thought this idea could push players to join in to win gold

The challenge finishes when it reaches 12 wins or when  you reach 3 defeats

If one wants to use only a weapon?

Coats of arms should be placed next to the clan tag

Here are some examples of coats of arms: