Wanna cheap and easy level up your account? Just add the bot http://steamcommunity.com/id/easycardbot/ as a friend and use next commands: !check - how many sets available for you considering your previosly crafted badges; !buy [amount of keys] - buy sets you haven't crafted for a specific amount of keys, e.g. buy 5 !buytf [amount of keys] if you want to pay for card sets using TF2 keys !buygems if you want to pay with gems 19 sets - 1 TF2 key 20 sets - 1 CSGO key 690 gems - 1 set
Now you can use Winter Sale Level up bot for Mysterious Cards http://steamcommunity.com/id/wintercardbot/