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

When you go on a massive winning streak, your trophy count inflates, and the algorithm begins matching you against significantly better players.
Do not expect to win every game.Because there are fewer Grandmasters, the algorithm struggles to find perfect matches.Losing streaks are also self-correcting. Level-Based Matchmaking
The standard Elo system works perfectly for chess because all pieces are equal, but tower rush games feature upgradeable cards.

To combat this, developers have implemented secondary checks that look at the player's King Tower level.
System PrioritySignificanceTrophy CountAbsolute Highest PriorityAccount StrengthThe system tries to match levels, but will abandon this check if the queue takes longer than 10 seconds The Esports Standard
By artificially capping all card levels to a specific number, the algorithm can rely purely on the Elo rating.

The algorithm is blind; it only respects victory.