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.

Professional players build their decks specifically to minimize the chances of a truly unplayable starting hand.
Balance your average elixir cost.Try to fix your rotation safely.Move on to the next match quickly. Unit Targeting and Pathfinding
Another subtle layer of RNG comes from the slight inconsistencies in how the game's AI handles pathfinding.

Relying on a unit's aggro range down to the exact pixel is risky because tiny bumps can alter their trajectory.
Game StyleLevel of LuckAuto-ChessSkill comes from long-term statistical managementStandard Tower RushHighly skill-dependent after the first 30 seconds 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.