Can we bring back Zephyr?
If the general tenacity was too much then maybe you could turn it into an anti kiting tool. Maybe something like this.
===Zephyr===
+
Total Cost: 3000
+50% attack speed
+30 attack damage
+10% movement speed
+10% cooldown reduction
Unique Passive: Wind Resistance: You gain 40% movement speed and slow resistance while moving towards an enemy champion that has hit you with a basic attack or spell within the last 2.5 seconds.