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.

Every single gold coin and green gem must be managed with the precision of a corporate accountant.
The Golden Rule of Gold
Upgrading a single card to the maximum level requires hundreds of thousands of gold coins, an amount that takes weeks of daily play to accumulate.

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.
Participate heavily in Gold Rush events.Minimize the new gold investment.They are simply too expensive and rare for F2P players to rely on. Hoarding Gems
The game will constantly tempt you to spend these gems on speeding up chest unlock times or buying shiny emotes from the shop.

You are essentially betting your gems on your own mechanical skill, converting premium currency into massive piles of gold and cards.
Purchase OptionEfficiencyEconomic RealitySpeeding 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 Playing the Long Game
You will lose games to players who simply bought better stats, and it will be infuriating.

The dedicated F2P player will always outlast the impatient whale.

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