First off, why wouldn't you? If you are looking to become an ADC or you wanna learn more champions, definitely look to select this champion into your arsenal of champions you can play. Her Q is a wave clear that during the late game can destroy anyone who wants to rush your back lines alone or in a group of two whilst also having amazing clear for the laning phase. Start off the game with this ability. Next, her W allows Kai'Sa to fire off a small projectile that goes in a line until it hits an enemy champion applying your passive onto them. Use this to hit running away champions to secure the kill, and always keep in mind that your allies with immobilizing effects, like stuns and what not, can also help stack your passive. Her E gives her a speed boost for a while then will increase her attack speed for a few seconds. Use your E to run away, flank an upcoming enemy skill shot, or at the start of the team fight so that you can dodge and weave then hit them like a truck going 100 mph. Finally, her R allows her to jump to an enemy in a certain range for a duration as long as they have been hit with plasma.