CommentStreams:Fffe5b3c344c482c06ceff3c6ded85a7

They have chosen a very different approach. You are matched based on your total troop power. The stronger you are - the fewer matching guilds there is. So near the top guilds fight each other 2-3 teams each season.

And ensuring opponent uniqueness is probably too complicated for the stateless algorithms they seem to be generally using.