How to purchase card packs in the Shop?

You can launch the Card Shop from the game's main menu. To buy new card packs, you can use zennies, Jewels, or “Core Card Packs”.

You’ll obtain zennies and Core Card Packs from daily login bonuses, whenever you level up heroes, complete achievements, and complete daily, limited, or season pass missions.

Jewels is the game’s premium currency and can only be bought using real money via the Jewel Shop. For one-time purchase only, you can buy a pack with 1500 jewels for around $5 (USD). The normal jewel cost per card pack you buy is going to be around $2 USD. Like other games with microtransactions, it seems that you'll get more value for your money by getting the more expensive packs since they'll have bonus jewels included.

Access the (Card) Shop from the main menu. From there, you can use any of the three methods to purchase card packs. Each pack contains 6 random cards and costs 240 zennies or 240 crystals. The appearance rate of different card rarities are listed below:

Be sure to check the available pool of cards that you have the chance to draw, per rarity by tapping the “Check Cards” button in the bottom-right of the Card Pack banner. At the game's launch, there's only one banner or card set available; however, it's safe to assume that we'll get more card sets available in the coming months.