If this system fails, the game becomes a frustrating, unplayable mess that bleeds players instantly.

Many players believe that matchmaking is intentionally rigged against them, constantly forcing them to fight 'hard counters' after a win streak.
How You Are Ranked
Most modern strategy games utilize a modified version of the Elo rating system, originally designed for professional chess.

When you go on a massive winning streak, your trophy count inflates, and the algorithm begins matching you against significantly better players.
Do not expect to win every game.Because there are fewer Grandmasters, the algorithm struggles to find perfect matches.Losing streaks are also self-correcting. The Free-to-Play Dilemma
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.
System PriorityWeightElo RatingAbsolute Highest PriorityKing Level / Card LevelsSecondary Priority The Esports Standard
Because the ladder algorithm must balance queue times against fairness, it will never be perfectly balanced.

Trust the math, ignore the conspiracy theories, and focus on improving your own gameplay.