I mostly use LoL events as an excuse to grind LoL15 for 4* colorless awakening shards (by far my most limiting factor in the game). As a result, I have a LOT of 99 stacks of rare souls. I did a significant amount of the BoS event with those Rares and I still have a ton. I would love to have something in the store that I can dump large numbers of them into (the monthly 50 for hearts doesn't make a dent).

I mean, not to get Meta, but if I could buy 10-20 4* colorless awakening shards for 99 rare souls, I'd clean out my inventory.