Random Number Generation, or RNG, is a highly debated topic in almost every competitive video game genre.

Understanding exactly where randomness factors into the equation allows top players to mitigate its negative effects.
Starting Hands and Card Rotation
Your starting hand is entirely random, which can immediately put you at a massive disadvantage against an aggressive opening.

By ensuring a healthy mix of low-cost cycle cards, they guarantee they will always have some form of defense.
Make the best play available with what you have.Remove the guesswork from the mid-game.Some RNG is healthy for the game. Troop Movement Quirks
Sometimes a unit will retarget unexpectedly due to a micro-movement by another troop, completely ruining your defensive setup.

Leaving a slight margin for error in your defensive placements is the best way to handle AI unpredictability.
Genre TypeRNG DependencyDrafting GamesSkill comes from long-term statistical managementStandard Tower RushVery Low - Only the starting hand is randomized The Mental Game
The best competitors accept the chaos, focus on what they can control, and outplay the opponent regardless.

If you are stuck in a lower arena, it is because of your fundamental mechanics, not the random number generator.