Two meters on the Packs tab reward you as you open packs. The line next to each meter shows how many credits are left until it fills.
How does the Lucky streak work?
Every pack you open without an Epic or better adds its price to the meter. When it is full, your next pack holds an Epic or better, guaranteed. Pulling an Epic or better starts the meter again.
How does the Pack Pass work?
Every pack you buy with credits fills it. When it is full, you get a free Ignition Pack and the meter starts again. Free packs do not count towards it.
What are Special Packs?
Time limited deals on a specific pack, shown at the top of the Packs tab with a countdown. When the clock runs out they are gone. If a Special Pack deal and a chain discount both apply, you get the better of the two.