User blog comment:Leyrann/Riven Rework - Yes she may be able to use one/@comment-24947613-20150127063155/@comment-24947613-20150127073235

If she can build up enough ki during single rotation with a champion, then she clearly doesn't even need ki at all, it is unnecessary complication you can just give her Heimer-like R. If she can't, she will become sustained DPS fighter instead of AD caster she is now. Its a completely different playstyle that doesnt match her kit.