Corsetti's Kayle top

Kayle is very mana hungry, start with 2 mana pots over 2 health pots or if you think you need a health pot, buy 1 mana pot and 1 health pot. You need to base when you get 745 gold which should be exact timing with the 2nd cannon minion wave so you can base without losing many minions. BUY ANOTHER DORANS AND A FLASK. This is a massive power spike as it allows you to essentially never run out of mana and you can really start to bully your lane.

I've recently been buying sheen first item after you make your purchase of flash+2nd dorans ring. This is another decent power spike because since you're maxing q first, it amps up the damage from sheen and you can poke with q sheen proc into an empowered auto every few seconds for big damage. Its important to have as much up time with your E as possible, so after your sheen go straight into buying nashors. Boots varies depending on match ups, swifties are generally very safe because you can out run or chase down your opponents.

Wits end first item vs hard ap match ups. Also build defensive boots if you're in a losing match up(Ninja Tabi/Merc treads).Rylais can be built 4th item if you need the extra utility/tankiness. Zhonya could be built last item instead of Dcap if youre getting hard focused in team fights.