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

However, it still exists in subtle ways that can completely alter the outcome of a very close match.
The Luck of the Draw
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.
Always include at least two cheap defensive options.Don't panic if your starting hand is bad.Accept that sometimes you will lose to a lucky start. Unit Targeting and Pathfinding
While developers strive to make AI as predictable as possible, the physics engine can occasionally create chaotic results.

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 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.