So went ahead and upgraded blitz event to the top Onyx level tier, did each event the first time then 4 additional and pulled a banner once out of essentially 5 packs on each blitz event so far. Not sure if that is good but considering the very high cost it doesnt seem like it to me especially if you have to upgrade the blitz events daily. If its once per week or even better at once and that's it then probably worth it.
So went ahead and upgraded blitz event to the top Onyx level tier, did each event the first time then 4 additional and pulled a banner once out of essentially 5 packs on each blitz event so far. Not sure if that is good but considering the very high cost it doesnt seem like it to me especially if you have to upgrade the blitz events daily. If its once per week or even better at once and that's it then probably worth it.