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
While premium gems seem like the most valuable currency, veteran players know that standard Gold is the true, brutal bottleneck of progression.

You must brutally focus all of your gold entirely on your primary 'Main Deck'—the eight cards you plan to use on the competitive ladder.
Farm them relentlessly.Minimize the new gold investment.Do not upgrade Legendary cards unless they are absolutely critical to your win condition. The Smart Use of Premium Currency
As a free player, you will slowly accumulate a small stash of premium gems from daily chests and achievements.

The only mathematically sound use for premium gems is entering 'Global Tournaments' or 'Classic/Grand Challenges'.
The F2P PathExecutionThe One-Deck SpecialistPlaying the exact same 8 cards for two years straight until they are completely maxed, allowing you to finally compete globallyThe Guild PlayerFocusing on leveling 32 different cards to a medium level specifically to perform well in clan wars and earn the massive weekly chest The Marathon of F2P
Being a free-to-play gamer requires an entirely different mindset; you must view your account as a long-term investment portfolio.

The dedicated F2P player will always outlast the impatient whale.

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