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The presence of luck-based mechanics in a strategy game can be both a blessing and a massive frustration.

Understanding exactly where randomness factors into the equation allows top players to mitigate its negative effects.
Initial Deck Shuffling
Your starting hand is entirely random, which can immediately put you at a massive disadvantage against an aggressive opening.

Professional players build their decks specifically to minimize the chances of a truly unplayable starting hand.
Never run a deck that is too heavy.Try to fix your rotation safely.Move on to the next match quickly. Unit Targeting and Pathfinding
Sometimes a unit will retarget unexpectedly due to a micro-movement by another troop, completely ruining your defensive setup.

To counter this, veterans always place defensive buildings in exactly the same specific tiles to guarantee consistent pulls.
Battler CategoryLevel of LuckAuto-BattlersSkill comes from long-term statistical managementStandard Tower RushMatches are decided by placement, timing, and resource tracking Accepting Randomness
The most important skill regarding RNG is learning how to control your emotions when luck inevitably turns against you.

If you are stuck in a lower arena, it is because of your fundamental mechanics, not the random number generator.