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

While this conspiracy theory is widespread, the reality is much more mundane and focused entirely on mathematical fairness.
Trophy and Rating Systems
Your trophy count is a numerical representation of your skill; win a match, and you take trophies from the loser.

This is why winning streaks inevitably end in a 'wall' of difficult matches; the system is functioning exactly as intended.
The algorithm does not care what deck you are playing.Accept the RNG.AI opponents ensure instant queue times for beginners. 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.

However, if no such player is available, the algorithm will prioritize queue speed over level fairness, resulting in those frustrating, mismatched games.
Conspiracy TheoryHow it Actually WorksThe Loser's QueueThe algorithm does not force losses; you are simply playing tilted against harder opponents because your MMR is inflatedThe Deck Counter CodeDevelopers have confirmed repeatedly that the algorithm does not read the contents of your deck when finding an opponent True Fairness
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.