Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This build is trying to build as much damage with survivability as much as possible, including cooldown reduction as you need to keep your E on to deal damage. [You are not capable of going in and whack people, you are not Master Yi.] This build gives you roughly 33% cooldown reduction which is pretty decent. [Your E will be 0.8 seconds cooldown with 40% cooldown reduction.]
Well, of course I pick Attack Speed for Mark. For Seal, I have lots and lots of problem with mana early game even though i got a Meki. Glyphs are all building for cooldown reduction. Quinces just for survivability.
Berserker Greaves - more AS, more damage.
Phantom Dancers - so you whack like a beast.
Nashor's Tooth - just awesome for Kayle... AP, AS, CDR.
Guinsoo's Rageblade - Make you even more deadly, more AD, AP, AS.
Warmog's - I played **** loads of Master Yi and he is a glass cannon. You go in, kill one, two champs and died. Warmog's gives Kayle more HP to stay in the fight longer even though you already stay back behind the team while the enemies focusing on your carry as they think you are a support Kayle. This is actually a situational item, depends on the enemy team whether they are stupid or not. I have played a game which my HP is only 2,000 and NO ONE on the other team attack me. I went in with full health and came out with full health, killed them all.
The Bloodthirster - More damage, and lifesteal.
Most people pick up Ghost and Flash for DPS Kayle, but I think Flash doesn't really help much compare to exhaust, as it keep your enemy in your range and also blind it.
When go in for a team fight, try to stay back a little bit (behind tank, in the bush, whatever.) Start by Q, pop E and whack them up. Keep your eyes on your teammates as you need to heal, ult them to keep them up as well.
Definitely go mid as you need to farm lots of money for those expensive items. You will farm a lot better once you get Zeal and Nashor's tooth.