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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
The algorithm's primary goal is to match you against someone with the exact same—or very similar—trophy count.

This is why winning streaks inevitably end in a 'wall' of difficult matches; the system is functioning exactly as intended.
It only looks at your numerical rating.Accept the RNG.It helps them learn before facing real humans. Level-Based Matchmaking
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.
Conspiracy TheoryThe TruthRigged MatchmakingThe 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 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.