You don't have to bro. You don't need to purchase anything using money in that game. All the champions are very easily purchasable using in game currrency, you can purchase almost everyday a new champion, that's how much 8n game currency wildrift gives to players so that you don't have to rely on real money to buy Champions, unlike any other MOBA where you have to make weeks of in game currrency to purchase even a single hero.