This is as simple as you can get, but the bottom line is that you can go to the in-app store, and buy a new pack of cards in the Kard Pack section with whatever souls you have. (Yes, they spell it with the letter “K” too!) The Kombat Pack assures you of one silver card and two random cards, while the Alliance Pack comes with a random that could either be a silver or a gold card.
Unlike the first option, the Character section allows you to buy silver or gold cards, but this time with coins and (generally) not souls. Scrolling to the right allows you to shop for silver cards, while you’ll find gold cards even further right. Take note that some gold cards cost coins (or koins), while majority will cost you souls.
Challenge Mode will give you the chance to win a unique featured character, provided you win the battle presented to you. You’ll have to beat all the towers within the specified time, so devote all your energy to Challenge Mode if you plan to go this route.
We had told you previously that doing these gives you a chance to earn extra souls. Likewise, completing a daily challenge or connecting your mobile game to the console version will also give you a chance at a gold or silver rare character card.