Pros / Cons

• Extremely mobile
• Nobody snowballs like Katarina
• Got some crazy stunts
• Can go both top and mid
• Hard to gank, "free flash" with wards

• Countered hard by crowd control effects if not played smart.
• No crowd control (that's why we build items with slow effect)
• Hard to master, it's all about timing (need general knowledge of all champions to be really successful with her)

Example Builds

Build 1, Standard Katarina:

Build 2, Snowball Katarina:

Mejai's Soulstealer

Malzahar

Warwick

Quicksilver Sash

Build 3, Shunpo Katarina:

Shunpo

Build 4, Survivalist Katarina:

Maw of Malmortius

Zhonya's Hourglass

Skills

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• Voracity: This is what make Katarina so deadly and it's your most important spell. Allowing you to do some crazy stunts and still get away with it. Also a good spell for cleaning up the battlefield after a teamfight, quadras and pentas are more common with Katarina than with any other champion.
  
  
• Bouncing Blades: Really strong during the laning phase, helps you keep the lane balanced against strong pushers and is an excellent spell to harass with combined with Preparation.
  
  
• Preparation: The spell alone is pretty dull but 240 extra damage on a full Death Lotus at rank 5 is kinda nice, but it's by combining it with Shunpo or Bouncing Blades that makes this spell really good. Combined with bouncing blade allows for some long range harass with high damage and gives a nice healing debuff for reducing the healing from potions and to reduce the effectiveness of health regenerating champions like Warwick, Swain and Vladimir.
  Combining it with Shunpo allow you to become tanky for a short period of time, perfect for tower dives or when you jump to the middle of a teamfight to use Death Lotus
  
  
• Shunpo: One of the most versatile spells in the game, gives some great utility in lane allowing you to easily dodge ganks. Great ability to flee and chase with. Can be used on everything with a health bar, Sight Ward and Noxious Trap etc (more about this in the ward section).
  
  
• Death Lotus: A powerful spell that most people focus way to much on when they play Katarina. Each stun/knockback/silence effect is able to break it and you'll be in a very uncomfortable position if that happens. You need to be patient and watch carefully when enemies are throwing their CC spells, you want your enemies to have their CC spells on cooldown when you decide to engage with Death Lotus.
  

Items

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• Hextech Gunblade: The best item that was ever created, for Katarina at least. Good stats and the activate brings a damage slow to our combo. Making Katarina even deadlier.
  Tip: The activate can be used while Death Lotus is active without interrupting it.
  
  
• Sorcerer's Shoes: The only boots you will ever need on Katarina. Our playstyle allow us to not build tenacity.
  
  
• Rabadon's Deathcap: Best AP item, enough said.

Boots

Health Potion

Hextech Revolver

Sorcerer's Shoes

Bilgewater Cutlass

Hextech Gunblade

Rabadon's Deathcap

Health Potion

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• Zhonya's Hourglass: Perfect item for Katarina's playstyle. The activate is really useful to dodge burst spells and to survive when all your spells are on cooldown. Shunpo into a teamfight, cast Death Lotus, none dies!!?? Activate Zhonya's Hourglass and use Shunpo either to kill or flee.
  
  
• Abyssal Mask: Adds some well needed magic reistance and a bunch of AP, one of my favorite items in the game for mages. The aura effect is also very strong, reducing a maximum of 100 magic resistance on enemy team.
  
  
• Rylai's Crystal Scepter: Adds a awesome slow effect allowing you to easily chase people down and enhances your Death Lotus. The extra health is also nice vs strong AoE teams. It's a good item for Katarina, but I rarely build it since I use the slow from Hextech Gunblade, but it's a good substitute for when it's on cooldown.
  
  
• Haunting Guise: Great mid game item, adds some extra health with the magic penetration. Combined with Sorcerer's Shoes and Greater Mark of Magic Penetration this item is really powerful mid game.

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• Quicksilver Sash: Since I give little attention or respect for Tenacity on Katarina, this item really comes in handy. Allowing you to remove Dots and CC effects. A good item if you find yourself getting caught by Warwick's or Malzahar's ultimate etc.
  
  
• Guardian Angel: Tbh, I maybe build this item 1 out of 50 games on Katarina. It's a really good item, but it doesn't really fit (my) Katarina. I prefer to build offensive items with defensive stats instead.
  
  
• Maw of Malmortius: Strong item, gives a 400 damage shield (magic damage) and adds some nice extra attack damage. Recommended if you are up against a strong burst mage like LeBlanc, Veigar or Kassadin.
  
  
• Mejai's Soulstealer: I only buy this when I know that im going to snowball, I decide this about 10 min into the game. Some people just can't handle Katarina in lane, use that as your advantage and 20 stacks will not be that hard to reach.
  
  
• Void Staff: I rarely build this one because the targets we are supposed to kill doesn't really stack Magic resistance, and if they do.. You build this one.
  
  
• Mercury's Treads: I don't think I've ever used these on Katarina, she dosen't really need the Tenacity if you know what you are doing. You should only build these if you go for a Void Staff. The stats from Sorcerer's Shoes is far more beneficial for you.

Laning Phase and Roaming

• Best and most suitable lane for Katarina, allowing us to easily access all lanes and jungle for ganks. Katarina is one of the most powerful gankers after level 6 and our Greater Quintessence of Movement Speed highly boost our ability to roam.
  
  
• While in lane you should focus on last hitting with melee attacks and harassing your enemy with Bouncing Blades. Only last hit with your spells if you getting pushed back to much or if there is no other way to get the minion. Katarina is a highly offensive champion who relies on champion kills to be effective, harassing your enemy is a critical aspect in our play style. If you can't get kills on lane you need to get them somewhere else.
  
  
• Shunpo is your best spell to defend yourself against gankers, never use it for harass or last hitting if you got no clue where the enemy jungler is or if someone is MIA.
  
  
• Sight ward are highly usable in mid lane, sometimes I find myself flanked by the enemy jungler if they gank properly when I got my lane pushed. By using a sight ward and jumping to it with Shunpo will save you many times (more about this in the ward section).
  
  
• A wise tip is to always have a ward placed in one of the river bushes. This will often prevent ganks and allow you to easily escape either by using Shunpo on the sight ward or running the opposite direction if the ganker tries to enter your lane from the warded bush.
  
  
• If you have killed your lane opponent always push your lane after, this will result in your minions getting killed by your enemies tower, meaning your opponent will lose experience and gold since he/her won't get the last hits on that minion wave.
  This is a very underused tactic, but one of the best. Getting yourself a kill and denying your opponent gold and experience will ease your lane and allow you to push and roam more frequently.
  
  
• Recommended, try to always have 2x Health Potions and 2x sight wards in your inventory. Always being able to heal with potions and to use wards for Shunpo will greatly boost your sustain and survivability.

• A viable option for Katarina thanks to her Shunpo offering some strong mobility to dodge ganks. Vladimir and Teemo are popular champions for top lane and Katarina is strong counter against them. Imo Katarina is a better mid champion because she is such a strong roamer, but if your enemy team picked a weak opponent against Katarina for top lane, you should go there. Or if they picked a really strong counter against Katarina for mid lane, Viktor etc.
  
  
• Sight ward is a must for every lane, especially for top. The top lane is longer than the mid lane making you more vulnerable for ganks, so always have the river warded (see the ward section).
  
  
• When you play Katarina in top lane you should focus less on roaming and more on getting minion kills, getting a kill and snowball our lane is still or main priority. And always try to push your lane if you kill your lane opponent or if you force him to recall, denying your opponent gold and experience.
  
  
• Recommended, try to always have 2x Health Potions and 2x sight wards in your inventory. Always being able to heal with potions and to use wards for Shunpo will greatly boost your sustain and survivability.
  

• After level 6 Katarina becomes really scary for low health champions. And your job is to bring havoc. By using Greater Quintessence of Movement Speed we got our self good base movement speed, this has a major impact on or ability to leave our lane (roaming) and help keeping pressure on our allies lanes. The low cooldown on Death Lotus allow us to frequently and effectively gank top and bot lane and Voracity is very effective for tower dives.
  
  
• If you got your lane under control, try to keep pressure on your lane, focusing on damaging your opponent so he needs to back as often as possible and roam whenever you get the chance. Our job is to ease our allies lanes and give them the advantage by constantly helping them out. Thanks to our superb mobility and low cooldowns this is what we do best.
  
  
• Sight wards and Health Potions are really important as a roamer, since we risk getting caught when we are running through unwarded territory we need the sight ward for escape or provide vision so we don't get ganked while we are ganking. The Health Potions comes in handy since we most likely will take some damage while we gank, either from turret or enemy champions. This will allow us to return to our lane without having to recall.
  
  
• Don't over do it, we still need our farm if we can't manage to get kills.
  
  
• Analyze the lane you are going to gank before you engage, vision possible outcomes. Ask yourself, what kind of CC do your teammates and enemies have, do they have Exhaust/ Flash, who is the weakest and easiest to kill, do they have any escape spells, ( Quickdraw and 90 Caliber Net etc.)?
  Always plan your ganks after these questions, timing and preparation is everything with Katarina. Failing a Death Lotus is always your fault, so ANALYZE your ganks.
  

Playing with wards

• Always try to have at least one Sight ward in your inventory. Two wards is highly recommended.
  
  
• A Sight Ward can be used over walls, use that to your advantage, allowing you to "free flash" over the wall. Great for chasing/fleeing.
  
  
• If you got fast reactions you can dodge incoming skillshots, Enchanted Crystal Arrow, Trueshot Barrage and Finales Funkeln etc. with Sight ward+ Shunpo combo.
  
  
• By placing a sight ward before you go for a kill in a tricky/crowded situations, will in most cases secure your escape route and you will be able to save your Flash, mostly.
  

Katarina vs.

• No lane opponent is impossible for Katarina but you will have to adapt and analyze your enemy, this is what makes Katarina so complex.
  
  
• You need to know the skill set and combos for each champion to be really effective against them.
  
  
• You wait for your targets to make a mistake and then use it against them.
  
  
• Good reactions and timing is the key to win your lane.
  

Difficulty
Medium
Tip
Best tactics against Akali is to play really passive, she will constantly try to hit you with Mark of the Assassin, make sure that you don't get in her melee range when you have been hit with it, debuff is where 50% of the damage comes from and can only be triggered by a melee attack. So keep distance. We need to constantly hit her with our Bouncing Blades, this can be a bit frustrating before lvl 4, because our range harass has about the same range. So we will most likely eat a few Mark of the Assassin, this is ok but we need to make sure that we win the harass game. Like always, make sure to use your debuff on her when she is using a Health Potion. Now to lvl 6, Akali now has Shadow Dance and will start to play very aggressively, she will most likely try to hit you with a Mark of the Assassin and follow up with Shadow Dance, when you see the projectile coming for you try to position yourself near your creeps and away from her creeps. When she jumps on you, instantly use your Death Lotus. She is either going to take a lot of damage our use her Flash, if you still got your Ignite ready you could probably go for the kill, depending on how much health she got left. Her Twilight Shroud is easily countered as well, our Death Lotus can still hit her while she is in stealth.




Difficulty
Medium
Tip
If you can manage to stay out of her Noxious Blast you will have no problems against Cassiopeia. Constatly harass her with Bouncing Blades and keep her health dropping, she should be a easy kill by level 6 with Death Lotus. When you are using your ultimate against Cassiopeia always face your back against her before you cast Death Lotus, or else you will most likely get stunned by Petrifying Gaze and probably die. So Shunpo and make a fast click to face your back against her before you use your ultimate.




Difficulty
Hard
Tip
Kennen is one of the most annoying to lane against for melee champions, he constantly tags you with his W and pokes hard, you need to dodge his Q by standing behind the creeps, think twice before you engage him with melee range. A fast stun from Kennen can easily be your death. So check his energy bar before you decide to engage him with your Death Lotus.




Difficulty
Easy
Tip
Mordekaiser is relatively easy to win against, the only problem for Katarina against him is that he can easily out push her. Keep distance and don't go in for melee last hitting if you know that he has Siphon of Destruction off cooldown. We don't want to take unnecessary damage against him. Most Mordekaiser players tend to focus on harassing the enemy, we will use this to our advantage. Iron Man will slowly drain out when they focus on hitting us with the damage. We are smart and do not position ourselves with the minions, instead we stand next to them so Mordekaiser won't be able to hit both us and the minions in the same Siphon of Destruction, constantly tag him with Bouncing Blades when his shield is low and make sure to add the healing debuff if he uses a Health Potion. Keep this going until lvl 6, you should have more %-health than him by now if you done everything right. Now it's time to kill him, always and I mean always hit Mordekaiser with the healing reduction if he has Children of the Grave ready before you use your Death Lotus, if you don't to this he will most likely heal a bunch of hp and kill you instead. Make sure that you choose the timing for when you engage him wisely, you don't want to engage a full shield Mordekaiser. Bait the Siphon of Destruction so he won't be recharging his shield on minions. Shunpo him and use your Death Lotus, make sure that you either have Ignite or a Preparation+ Bouncing Blades activated on him.




Difficulty
Easy
Tip
He can be annoying during the first 3 levels, so play passive and just try to tag him with Bouncing Blades, Katarina eventually out scales him and should be a easy kill by lvl 5 or lvl 6. He can't do anything to interrupt your Death Lotus. Free kill when you get Hextech Gunblade, the slow effect + your ultimate will force a Flash or get you a kill. A bad Teemo is a perfect target to farm Mejai's Soulstealer stacks on.




Difficulty
Medium
Tip
Only use Shunpo after his Hungering Strike in lane, to prevent you from taking unnecessary damage when harrasing. Use Bouncing Blades as often as possible on him to constantly bring his health down so he need to waste his mana for sustain, always combine with Preparation when it's off cooldown. Infinite Duress mana cost is 100/125/150, keep that in mind before you engage him when he has ulti ready. I usually try to bait is ultimate with my Death Lotus since it has lower cool down, and go for the kill next time when my ultimate is refreshed. Warwick is hard to kill, boring lane for Katarina, try to roam whenever you get the chance.




Difficulty
Medium
Tip
Wukong's Crushing Blow can be eaily dodged with Katarina, each time he use his Nimbus Strike against you, you need to instantly use Shunpo on a minion/champion/ward to get out of his reach, This results in mana loss for him and you only take damage from Nimbus Strike. Best way to out sustain him in lane.