This build only works if you got good teamwork and you can gank alot. I also prefer playing Kat on 3v3.So the plan is to farm farm and gank. its easy to farm minoins you just have to take advantage of your killer intstincs>bouncing blade. and you also got to gank alot. The money rolls in easy especially for kat for her passive gives he 50 extra gold on kills and ***its and it gives you good cooldown reductoin so dont be afraid to use your ult. The extra money from her passive will help you get those expensive items. You dont need any extra att speed since all your att speed comes from runes and boots and a little from masteries so i dont recomend getting att speed items.Exhaust always you to slow down your enemies when you decide to ult and it would give them alot of pain. But remember that your ult only effects 1 person at lvl 1 2 at lvl 2 and 3 at lvl 3, thats why I recommend kat for 3v3s. Also remember to harras your ememies with bouncing blade and if you can activate your killer instincts for extra damage.