Gain increasing amounts of AD or AP, Adaptive over the course of the game.
Fleet Footwork's bonus healing scales well with Kaisa's standard AP on-hit build allows you to heal for massive amounts in lane and in teamfights.
Overheal's extra bit of health buffer is great for all-in duels if you're able to build the shield before diving in with [R]. Items like Deaths Dance and Legend: Bloodline will help you build and shield and sustain in lane.
Kaisa is all about auto attacks to build her passive stacks to pump out damage so Alacrity is the ultimate choice here.
WhyCoup De Grace
Coup De Grace's execution damage helps you to shred the enemy backline target's quickly and seamlessly so that you're able to get out and move on for more damage.
Absolute Focus's extra bit of Attack Damage is incredibly value and key to your dueling power. Death's Dance and Legend: Bloodline help keep you above the health threshold.
Gathering Storm is your late game damage insurance policy, allowing you to scale and take over fights/duel any in a 30min+ game.