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

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.

If the system matches you perfectly, you should mathematically have a 50% chance of winning every single game you play.
There is no 'anti-deck' conspiracy.If you face a hard counter, it is pure statistical variance.It helps them learn before facing real humans. The Free-to-Play Dilemma
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.
Algorithm CheckWeightTrophy CountAbsolute Highest PriorityKing Level / Card LevelsSecondary Priority Maintaining Competitive Integrity
This is why all true esports tournaments and competitive challenges utilize the 'Tournament Standard' ruleset.

The algorithm is blind; it only respects victory.