Good build? GOOD BUILD? This build is a disgrace to all Katarina builds. Since I don't feel like typing the fact that AD items on Katarina, other than Hextech Gunblade are bad, I'm just gonna quote someone else. Here we go:

___Whatever was in this section before the Kat rework is no longer relevant. Kat no longer is even somewhat viable with only AD or a little of both.

______Her main harass and damaging non-ultimate ability, Bouncing Blades, scales with AP ONLY -- so does Shunpo. Keep in mind that one unit of AD is about equal in ratio to two of AP (hard to compare items, considering The Bloodthirster uses stacks, Rabadon's Deathcap has a percentage increase, etc. -- but, in general, at full build, a standard AP carry will be at ~700 AP, and a standard AD carry at ~350 AD [ignoring baron buff]). With this knowledge, look at Sinister Steel, one of the only two abilities of Kat that scales with AD. Now look at the ratios: 60% of bonus AD, 30% of AP. Bonus AD on a general AD carry would be around 250, considering base is around 100 at level 18, give or take a few. However, there is no base AP. You would think, on Sinister Steel, that the amount of damage received at full build going full AD or full AP be around the same, due to the 2:1 AD:AP ratio and general 2:1 AP:AD ratio at full build. However, knowing that the scaling for Sinister Steel only takes bonus AD into account, at a full AD and AP build, you will still be getting more damage on this ability going AP.

______This point carries over even stronger with Death Lotus. The ratio for AD is +3 per bonus AD, and +1.75 for bonus AP; not only does the "bonus AD" point remain intact here, but the AP ratio, keeping the 2:1 in mind, is actually larger -- it's something around 2:1.2. Which means AP is even more so stronger than AD than on Sinister Steel.

______Of course, this 2:1 AP:AD ratio is derived from a standard AP build, with 5 AP items and boots, and a standard AD build, with 3 AD items ( The Bloodthirster, Infinity Edge, Last Whisper), boots, a Phantom Dancer, and a defensive item ( Guardian Angel, Quicksilver Sash, Banshee's Veil). If you were to build AD on an AD caster, who would still primarily use her abilities, then you would probably drop some of the items like Last Whisper, Infinity Edge, and Phantom Dancer, since those all help with auto attacks (armor pen, crit damage and crits, attack speed). Theoretically, you could just get boots and 5 Bloodthirsters, and then have 500 bonus AD. But then, you will have to constantly keep up your farm stacks to do the most damage you can, and you will have no utility whatsoever (CDR, magic pen, armor, MR, all the good things you need besides just straight damage). True, at this point your Sinister Steel and Death Lotus would hurt a little bit more than going AP (only a little more though -- around 100 more on Sinister Steel and about 275 more on Death Lotus), and your auto attacks will hurt a lot more (although, if you stack 5 BTs, you probably aren't going for auto attacks -- you are still a caster with a caster kit, and most of your time as Kat is spend using spells, even if you DO go AD: if you were focusing on auto attacks, you would take a standard AD carry build mentioned earlier). However, now two of your core abilities will deal virtually no damage ( Bouncing Blades and Shunpo), and you won't have any utility or actives ( Deathfire Grasp adds a lot to your burst, Hextech Gunblade ensures that you keep the enemy carry in range to blow up, and Zhonya's Hourglass can buy you that extra 2 seconds you need to get cooldowns back to net a kill where you would otherwise die, or to get your allies/creeps in range of you to Shunpo to). Worth it? Of course not.

______Even if you were to go full AD, and get a bit of damage on your Sinister Steel and Death Lotus (though not as much as you would going AP), you wouldn't have any damage on your Bouncing Blades, your bread and butter skill -- the skill you use to farm with in conjunction with Sinister Steel, as well as the skill you use to harass at range, with a whopping 0.7 AP ratio considering you detonate the marks -- nor would you have any damage on your Shunpo, which isn't as big of a damage factor as it used to be, but still adds some good burst to your combo, especially late game.

______The argument could be made that AD Katarina is still a bit viable considering you would hurt with auto attacks. However, your kit is a caster kit; especially with this item build, you are designed to jump onto the carries, burst things, and jump out. Do work, and you get your cooldowns reduced and you do it all over again. Is there really any time there to auto attack single targets? I sure don't see any. You'd be using your time better just waiting for spell cooldowns, or getting them refreshed by getting kills/assists in fights, and continually casting spells than spending time auto attacking champions.

-wRAthoFVuLK (Quote Taken From His Guide, which is also the highest rated Katarina guide atm)

It seems to be a good build, I've tried it in coop and I dealt a LOT of damages, so much more than before. I will try it on pvp. :)

I know the problem of bad teams :D ill get them every day...
well u could try to go for at least 1 premade , which could be an jungler.

THAT cc should do so well, u can't lose :D

and i like that you like my build :D

Best build I have tried for Kata, my last games

Bad teams until last match, look at my K/D ratio ^__^

This build is really good and fun to play! :D

Ty mate i really tried to do it the bet way, and in my opinion it is quite great :D

GOod build