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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.
Initial Deck Shuffling
The most prominent RNG element in card-based battlers is the initial four cards you are dealt at the start.

By ensuring a healthy mix of low-cost cycle cards, they guarantee they will always have some form of defense.
Balance your average elixir cost.Don't panic if your starting hand is bad.Accept that sometimes you will lose to a lucky start. The Unpredictable AI
Sometimes a unit will retarget unexpectedly due to a micro-movement by another troop, completely ruining your defensive setup.

Relying on a unit's aggro range down to the exact pixel is risky because tiny bumps can alter their trajectory.
Genre TypeLevel of LuckAuto-ChessExtremely High - Relies entirely on shop rolls and item dropsStandard Tower RushVery Low - Only the starting hand is randomized Accepting Randomness
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.