Suggested Rek'Sai R Change
As of now, Rek'Sai's ultimate is an execute that scales off 20% of the target's missing HP (Riven R). This means that the ultimate is almost always intended to be used as en execute and not a gap-closer, because using it as a gap-closer would mean the damage on the execute would be nullified.
What about adding a gap-closing effect on the end of the ult that would allow Rek'Sai to kite targets down by jumping behind them? (similar to Warwick Q and Akali R). This effect would only work if the target is NOT executed by Rek'Sai ultimate and instead lives off, and this would add more gameplay to Rek'Sai as an assassin who can kite their victims. Currently, the target that gets jumped by Rek'Sai can easily flash the ultimate away and not take damage, but what if they get hit and then flash away from Rek'Sai, living off with little HP, and the Rek'Sai has no tunnels or burrowed Q to snipe them? With this gap-closer the enemy would have to flash INSIDE of Rek'Sai to survive, as they would expect her to jump behind them if they don't get executed.
This is my take on the change.