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

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

When you go on a massive winning streak, your trophy count inflates, and the algorithm begins matching you against significantly better players.
There is no 'anti-deck' conspiracy.Accept the RNG.In the lower arenas, the system often includes 'bots'. 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 MythHow it Actually WorksThe Loser's QueueThe 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 Maintaining Competitive Integrity
Because the ladder algorithm must balance queue times against fairness, it will never be perfectly balanced.

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