Overall looks like a mixed bag of costs:
1 rare for 25 common - about the same as you can get visa the sacrifice. 150 common - way too steep given 99 can bring 3 or 4 from the vortex.
25 frontier coins for 1 rare
Talismans seem ok value.
Rest is overpriced. 30 rare souls for a 4 or 5* gunner seems step (maybe 15 at most).
Saved souls in anticipation of this event - partly expected this to be more about buying specific toons (xyz Eddie for 500 common type of thing). High cost but pick your prize.
Hope this isn't a one off, it does have some good parts, just the values that seem out of balance.