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

Once the initial hand is played, the rotation becomes fixed, and pure skill and memory take over.
Never run a deck that is too heavy.Try to fix your rotation safely.It happens to everyone. The Unpredictable AI
Another subtle layer of RNG comes from the slight inconsistencies in how the game's AI handles pathfinding.

Leaving a slight margin for error in your defensive placements is the best way to handle AI unpredictability.
Game StyleRNG DependencyAuto-BattlersExtremely High - Relies entirely on shop rolls and item dropsStandard Tower RushMatches are decided by placement, timing, and resource tracking The Mental Game
The most important skill regarding RNG is learning how to control your emotions when luck inevitably turns against you.

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