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
Most modern strategy games utilize a modified version of the Elo rating system, originally designed for professional chess.

This is why winning streaks inevitably end in a 'wall' of difficult matches; the system is functioning exactly as intended.
Understand that a 50% win rate is normal.Because there are fewer Grandmasters, the algorithm struggles to find perfect matches.If you drop trophies, the algorithm matches you against easier opponents. The Problem of Card Levels
The standard Elo system works perfectly for chess because all pieces are equal, but tower rush games feature upgradeable cards.

The system will try its best to match you with someone who has the same trophies AND a similar tower level.
Algorithm CheckImportance LevelCurrent RankThe system will always prioritize finding an opponent within a 50-trophy rangeUpgrade StatusThe system tries to match levels, but will abandon this check if the queue takes longer than 10 seconds True Fairness
By artificially capping all card levels to a specific number, the algorithm can rely purely on the Elo rating.

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