Basically is to copy the current system of league trophies, but for clan war. You find your opponent in place for clan level, for clan trophies(not total points of the clan).
If you win the clan war, Your clan win some trophies, and add a small bonus (the same for all players in the clan) That little bonus grows depending on trophies clan.
If you lose the clan war, your clan lose some "trophies clan"
Your clan will be number one!
*Important: don't remove the actually bonus :)

