Amazing: Quest at diamond level in which I got only one potion

Its always says random distribution of reward and some one are much lucky compare to someones when u open and u will get potion as quest. Although its rate is high but still people like to see cards or pack over the quest potion.

I am also one of them, I can see I got only one poion quest ot of several choot chest after a long time such kind show sytem is how much random to give the reward.