Vayne ult suggestion

I haven't played this game in a couple months (aside from some account maintenance) but this random idea crossed my mind.

What if Vayne had a one-time-use tumble when she ulted, bound to R.

I have no idea about the state of Vayne (OP, UP) but this seems like a pretty reasonable buff if she's weak. Her ult always felt underwhelming to me anyway.