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.
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.
If you are hovering around 50%, you are in the correct arena for your skill level.Patience is required.If you drop trophies, the algorithm matches you against easier opponents. Level-Based Matchmaking
The standard Elo system works perfectly for chess because all pieces are equal, but tower rush games feature upgradeable cards.

However, if no such player is available, the algorithm will prioritize queue speed over level fairness, resulting in those frustrating, mismatched games.
Community MythThe Mathematical RealityForced Loss StreaksThe algorithm does not force losses; you are simply playing tilted against harder opponents because your MMR is inflatedRigged Deck MatchingDevelopers have confirmed repeatedly that the algorithm does not read the contents of your deck when finding an opponent 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.