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.
The Luck of the Draw
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.
Never run a deck that is too heavy.Cycle your cheapest cards in the back.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.

To counter this, veterans always place defensive buildings in exactly the same specific tiles to guarantee consistent pulls.
Game StyleRNG DependencyAuto-ChessSkill comes from long-term statistical managementStandard 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.