The matchmaking algorithm is the unsung hero that determines exactly who you will face every time you press the 'Battle' button.

Many players believe that matchmaking is intentionally rigged against them, constantly forcing them to fight 'hard counters' after a win streak.
Trophy and Rating Systems
Your trophy count is a numerical representation of your skill; win a match, and you take trophies from the loser.

If the system matches you perfectly, you should mathematically have a 50% chance of winning every single game you play.
If you are hovering around 50%, you are in the correct arena for your skill level.Queue times increase at the top of the ladder.You will eventually stabilize. Level-Based Matchmaking
The standard Elo system works perfectly for chess because all pieces are equal, but tower rush games feature upgradeable cards.

To combat this, developers have implemented secondary checks that look at the player's King Tower level.
Algorithm CheckWeightElo RatingAbsolute Highest PriorityKing Level / Card LevelsSecondary Priority Maintaining Competitive Integrity
This is why all true esports tournaments and competitive challenges utilize the 'Tournament Standard' ruleset.

When levels are equalized, the matchmaking system shines, ensuring that the better player almost always wins.