How about a mid laner with some of Soraka's old kit?
I think old Soraka had a great kit for a mid laner, maybe a bit cancerous but it was sad to see it go. It was loads of fun and was very effective. Perhaps you could add a mid laner that had most of her kit, except her ultimate because have 2 Soraka ultimates on the team would be pretty unfair to play against. Or maybe you could add 2 versions of Soraka but you can only have 1 Soraka in game, because old Soraka didn't have too many problems compared to the other champions that got reworked. What do you guys think? I'd really like to see this happen.