Why 3v3?

• There's less chance of getting a troll/afk (and if you get one you can surrender in 15).
• The games are faster.
• The map is smaller and there are less players, so it's easier to know what's going on in team fights.
• You feel like you're playing a larger role in the outcome of the game.
• Less chat/ping spam.

Teleport

Why LeBlanc?

• "COMBOOOOOOO!!!!" -Killer Instinct announcer. Long almost "dialing" combos
  
• Very versatile based on Mimic usage
  
• The whip sound when Ethereal Chains finishes SHwooooooOOOOO-*CRACK* (you know what I'm talking about!)
  
• Using Distortion over the base wall into the bush right outside, killing the champ recalling in that bush, and returning safely all in about 2 seconds. BURST!

Skill Sequence

Sigil of Silence -> ->

Ethereal Chains

Distortion

Sage

Mejai's Soulstealer

Distortion

Distortion

Mimic

Distortion

Ethereal Chains

LeBlanc

Distortion

Mimic

Distortion

Gameplay and Items

• The first item is Amplifying Tome, here's a shortcut to get it faster. Instead of scrolling through menus to find this, just left click once on Void Staff (one of the "Recommended Items" in the top right half of the store menu) and double click on Amplifying Tome at the bottom, in the components for Void Staff, to buy it. Then click the "consumables" menu and buy a Health Potion. The quicker you get to the bottom middle bush, the better chance you have for FB (first blood).
  
  
• In 3v3 you can return to base more often, so when building Rabadon's Deathcap you don't have to wait until you have enough money to buy a Needlessly Large Rod to return to base, just Improved Recall return, buy a Blasting Wand, and Distortion over the wall and you're back in lane. This ensures a steady AP rise throughout the game. Whenever you have enough money to buy the next item piece, blow your AP on killing a minion wave or minion camp and Improved Recall back to base to get it.
  
  
• Last hitting with LeBlanc is really difficult because her auto-attack does so little melee damage. Thankfully her animation and projectile speed are pretty quick. Before level 6 play defensively and use abilities to last hit as many minions as possible (daddy needs his Mejai's Soulstealer), saving your sigil of silence for the time when two minions go to low health at the same time, or for the big minion! Don't forget to use ALL your abilities for last hitting, Ethereal Chains too. Don't be stingy with mana, you need the gold and can always Improved Recall and can Distortion over the wall to get back into lane.
  
  
• Harass with Sigil of silence + Distortion[silence procs] + [reactivate] Distortion but remember your main focus is on last hitting minions! Try to last hit some minions with the harass.

In a typical LeBlanc game you go top and get harassed a lot, use a Health Potion at level 2-4 and return to base to heal up and buy another Health Potion. Then around level 5 you can usually buy Mejai's Soulstealer. Around level 6 you have Boots, and are ready to start ganking. First attempt is ganking top from the dragon by shooting over the wall with a Sigil of Silence + Mimic( Sigil of silence)[silence procs] + Distortion[silence procs] + Ethereal Chains[stun procs] + Ignite combo. Followed by a Flash + Sigil of silence + Ethereal Chains[silence procs][stun procs] to finish him off if necessary. These early kills are really important, so overkill is OK (wasting an Ignite), just get the kill ASAP. Otherwise gank bottom lane using same combo. She can Distortion over the bush in the bottom middle of the lane into the middle of the map too, so don't forget to use this to surprise bottom lane.

If you get stuck in bottom lane with a lane pushing champ or AD melee you're going to have a tough time last hitting. Take every last hit you can get, even if it means stealing his. These champs don't even have to think about last hitting. You have to work hard for all of them so unfocus your vision a little so you can see all the minions health bars, and hit as many as you can with abilities and your auto-attack.

After Sorcerer's Shoes, BUY A sight ward (or 2) EVERY TIME YOU GO BACK TO BASE. You will be reWARDed. It keeps your entire team from being ganked, it protects your Mejai's Soulstealer stacks, and helps you set up kills (she's an assassin after all). If you are fighting invisible characters, buy Vision Ward (but more sparingly). A well placed Vision Ward shuts Twitch down completely. Try to annoy/guilt your teammates into buying wards as well. If LeBlanc does not initiate she will die quicker than a 20-stacked- Mejai's Soulstealer- LeBlanc killing Tryndamere from a bush (which is so quickly that he can't Undying Rage). There needs to be a ward in the middle or at the dragon (both are better) at all times. For Vision Ward I like whatever bush the invisible character is using as his base. Wherever Shaco has his boxes stacked is where he feels the most comfortable. Usually inside the bottom right or left bush entrance to the middle. Get a Vision Ward in there! Wards are an essential part of playing LeBlanc. Avoid being KO'd by a kiss on the cheek from Jarvan IV, use plenty of wards.

Tactics

• To get a little extra range, make sure you are walking toward the target during the Ethereal Chains animation. LeBlanc will pause just a half-second to shoot the chain, then continue walking while it shoots.
  
  
• Wait until the animation for Sigil of Silence actually begins to use your Mimic( Sigil of Silence), because Mimic won't change to Mimic( Sigil of Silence) until the Sigil of Silence animation starts! Many times I've used Sigil of Silence on a champ but was out of range, so LeBlanc starts walking towards them, and then I use Mimic and it's a Mimic( Ethereal Chains) or Mimic( Distortion), ruining the kill, and usually getting me killed because I'm so confused about what just happened.
  
  
• If you have Mimic( Sigil of Silence) already keyed up, use it before Sigil of Silence in any of these Sigil of Silence + Mimic( Sigil of Silence) combos. It will ensure you get the greater damage from Mimic( Sigil of Silence) when it is procced by Sigil of Silence and start its cooldown a little sooner.
  
  
• Reactivating Distortion and Mimic( Distortion) lowers the cooldown (you dont have to wait out the 3 second reactivation period), so always reactivate it when jungling or when it's convenient.
  
  
• Everyone is going to be super pissed when they see you are owning and have Mejai's Soulstealer and will enter a tower-diving- Youmuu's Ghostblade-activating blood-rage when LeBlanc so much as sticks her big toe out of a bush, so always think carefully about reactivating Distortion in a team fight (you will usually want to). It gives you distance and also helps you line up the Ethereal Chains skillshot better.
  
  
• Ethereal Chains does half its damage on hit and procs again for half in a few seconds. If you Ethereal Chains + Mimic( Ethereal Chains) the same opponent you will interrupt the first Ethereal Chains and not get half the damage of the first chain. Chaining multiple chasers is OK, but the Escape Combo(see "Combos" section) is safer if your Mimic is up and more reliable (but probably not as fun).
  
  
• Distortion resets its return marker when you cast Mimic( Distortion). For example, you can't cast Distortion + Mimic( Distortion) and then reactivate the first one to return all the way back to the first place you used it, you can only reactivate the Mimic( Distortion) and return to the last place you used it from. Which is lame! Riot hotfix please!
  
  
• If you use Sigil of Silence (or Mimic( Sigil of Silence)) and then immediately use Distortion, you can actually hit them with Distortion while your Sigil of Silence is still flying through the air. Therefore the Sigil of Silence won't be there to proc when Distortion hits. This can result in you missing out on a lot of damage. Make sure your timing is right by waiting a split second after using Sigil of Silence to use Distortion. You don't have to worry about this with Ethereal Chains, it's too slow.