The vast majority of mobile arena battlers utilize a 'freemium' monetization model: the game is free to download, but upgrading your units requires massive amounts of in-game currency.

Wasting resources on terrible cards or inefficient upgrades will mathematically cripple your account, setting your progression back by months.
The Golden Rule of Gold
The absolute worst mistake a F2P player can make is upgrading every single card in their collection evenly.

If you switch decks constantly and try to level up thirty different cards, you will end up with thirty mediocre, mid-level cards that are completely useless against maxed opponents.
These weekends are specifically designed to inject massive amounts of currency into the economy.If you must change decks, try to pick a new deck that shares at least 3 or 4 cards with your old deck.Do not upgrade Legendary cards unless they are absolutely critical to your win condition. The Smart Use of Premium Currency
You must resist this temptation entirely; speeding up a silver chest for 18 gems is the absolute worst financial decision you can make in the game.

You are essentially betting your gems on your own mechanical skill, converting premium currency into massive piles of gold and cards.
Purchase OptionF2P Value RatingThe ReasoningSpeeding up chest timersAbsolute Zero / TerribleYou pay premium currency just to save a few hours of waiting; provides absolutely no extra valueBuying Emotes / CosmeticsZero (Mechanically), High (Socially)Provides zero statistical advantage, but occasionally acceptable if you really want to BM your opponentEntering Grand ChallengesExtremely High (If Skilled)If you can consistently reach 10+ wins, the gold and card payout is the best return on investment in the entire game The Marathon of F2P
However, when you finally max out your deck through sheer grit and daily grinding, the victory is infinitely sweeter.

The dedicated F2P player will always outlast the impatient whale.

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