Board Thread:Question and Answer/@comment-70.70.29.204-20161017232109/@comment-28801439-20161022172713

No, you have not understand how it works imo.

The probability do not stay the  same as stated in the box summon describtion.

I think they determine where are the card each time you reset a box.

Why the ur is the last card?

It is because as stated in the summon rate, her apparition rate is not 1/77 as many players suppose when the box is reseted but lower: there is no equiprobability.

With that you are more likely to pick the ur as the last card because when the system attribute each spot for each card she has a lower chance to appear than any other card.

Summary for those who are lazy: box summon=rekt.