Small Reward-Based Buff For Varus

I always felt like Varus was a remarkably slow ADC, even with his six item build, he still seems to lag behind other champions in terms of movement speed, ontop of the fact that he lags behind super-ranged ADCs like Ashe, and Caitlyn who both have 600+ ontop of utitility that is more readily accessible and synergizes more easily with the rest of their kits and the surrounding team comp.

So I thought why not give Varus a small decaying movement speed burst every time he procs his W's blight stacks, enabling him to actually stick to his opponent, or possibly flee faster by autoattacking, Q/E'ing and then run in the opposite direction and vice versa., this way he gets rewarded for doing damage the way he always meant to.