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
If your opponent rushes the bridge and all your cheap defensive counters are at the bottom of your deck, you lose the tower.

Professional players build their decks specifically to minimize the chances of a truly unplayable starting hand.
Always include at least two cheap defensive options.Cycle your cheapest cards in the back.Accept that sometimes you will lose to a lucky start. The Unpredictable AI
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.
Genre TypeRNG DependencyDrafting GamesExtremely High - Relies entirely on shop rolls and item dropsStandard Tower RushMatches are decided by placement, timing, and resource tracking The Mental Game
The best competitors accept the chaos, focus on what they can control, and outplay the opponent regardless.

Over the course of a thousand games, the luck factor completely evens out for everyone.