There are many different places to get card packs in the game:

  • Free packs: you can claim one every 4 hours. They contains few cards and few chances at getting rare cards.
  • Reward packs: earned while completing a mission. Their size and content change depending on the difficulty of the mission.
  • Ticket packs: acquired via tickets through the shop. They provide more chances to drop rarer cards.
  • Premium packs: acquired with real money through the shop. Their size varies according to their price but they all have good chances of dropping rare and epic cards.