Distortion is an effective method of harrassment, as re-casting the spell will cause you to flash back to your casting position, giving an opportunity to deal damage with minimal risk of taking significant damage.
Distortion can also be used as a ganking tool as it can dash through enemies and has a second activation, that allows you to blink back.
Distortion can be used for turret diving, because LeBlanc can jump in for a kill under the turret, and teleport back to her location. Just make sure that everything is done within 3 seconds since the teleport location will be lost after 3 seconds and you may end up being killed by the turret.
LeBlanc can also towerdive by casting Distortion through a wall, unleash her combo and quickly blink back out. Keep in mind how quick you should be to cast your combo and how much health you and the enemy has. Don't forget the 3 seconds needed to retain the teleport location. Towerdiving from behind a wall can also be done in conjunction with Flash.
Mirror Image's clone acts like a pet. It will take commands similarly to Annie'sSummon Tibbers, and will stand around or auto attack if no orders are given. It is wise to move it for the means of confusing the opponent, as a stationary clone clearly betrays the real LeBlanc to the enemy.
Mirror Image's clone is a champion type unit and therefore can also be hit by abilities only able to target champions such as 凯特琳的Ace in the Hole. Take advantage of this by trying to encourage your enemies to use their powerful champion targeting ultimates on your clone by putting yourself out of site and controlling your clone like she were the original.
Keep in mind that your clones auto-attacks deal no damage which can give her away if an enemy notices this.
If you are being chased, throw Ethereal Chains on the pursuer for the slow and potential snare, giving you a better chance of escaping.
By selecting a target to cast Sigil of Silence on while out of range, you can use Distortion to close the gap, then use it again to return to safety. Doing this can extend the range at which you can safely harass and ward enemy champions from gold or experience.
A quick way to cast any of Leblanc's spells is to smart-cast them, either by remapping smart-cast spells to Q / W / E / R or holding shift and then hitting Q / W / E / R. When combined with the combo above you could potentially drop an enemy carry in one burst before they have time to react.
Mejai's Soulstealer can be especially powerful, particularly if mid-laning. Be warned that due to her already snowbally nature, getting killed while using this item may cause her to fall even earlier in the game than necessary.
Deathfire Grasp can be very powerful for LeBlanc as it covers AP and an additional spell in her combo with its Active, which will make her more of a threat in the later stages of a game.
Haunting Guise can be a good early game choice for LeBlanc, as it increases durability and damage, while also negating early game Magic Resistance. It can also replace Sorcerer's Shoes in many builds, allowing the use of other boots without sacrificing Magic Penetration.
Two Doran's Rings during early game can be a very powerful build. It is a cheap and highly effective item combo that can be sold later.
Because Mimic multiplies both the base damage AND the ratios on all of her abilities, pure AP item builds on LeBlanc are often the most powerful and effective builds.
Investing in an early Negatron Cloak for magic resistance will significantly reduce her burst damage. Later in the game, you can build it into a Banshee's Veil and disrupt her combo. Otherwise, if you are playing a squishy mage or AD carry, she will be able to burst you down even late game due to good scaling. Do NOT neglect MR.
LeBlanc relies heavily on spell combos, especially with her Sigil of Silence. Try to interrupt her spell combo in the middle of Sigil of Silence, as this will often force her back to wait for cooldown.
Be sure to commit to attacking her, as she can easily punish enemy champions with Distortion.
Presuring her into using both her dashes can set her up for a gank by a teammate from which she can't escape, as they both have long cooldown.
LeBlanc is extremely squishy so she is very vulnerable to hard cc, such as stuns and suppression, and focus. Taking her out of the fight early prevents her from being able to burst down a carry.
Mirror Image's stealth does not break the auto attacking AI's lock on her; allowing the autoattacking AI to continue without interruption can finish her off.
LeBlanc is notorious for being able to burst down AP mid laners. However, because she specializes on bursting one target, having your jungler gank during her dives will cripple her aggression significantly and cause her to fall off prematurely.
Warding brushes will make it harder for LeBlanc to juke using Distortion.