What are hero cards?
Hero cards allow you to increase your hero's rank.
The number of cards for each hero can be viewed in the “Heroes” tab. It also displays how many cards you need to accumulate to increase your rank.
Starting from level 60, hero cards are also needed to increase the hero’s level.
How to get cards?
Cards for random heroes drop from all chests. You can also purchase a chest with cards in the store.
Joker Cards
Joker cards are universal cards that can be applied to any hero by adding a certain number of cards to him.
For example, if you have 8 Joker Cards, you apply them to Firefly, and Firefly receives 8 hero cards. All available Joker Cards apply only to one hero you choose; they cannot be separated.