Not Updated For Current Season
If you cannot stack up your Mejai's Soulstealer then switch it out for a
You can swap out for or but most of the alternatives are subpar for LeBlanc.
Try to get your team to give you a solo lane, if not a duo lane can work with a stun or slow.
You want to harass as much as possible with your Sigil of Silence and using Distortion or Ethereal Chains to activate the silence.
When you hit 6 you can go for easy kills with your absurd nuke combo of Sigil of Silence > Mimic > Ethereal Chains.
If there are multiple champions attempting to gank you, you can easily escape with Flash and Distortion into a Mimic.
If you are certain that you can burst a champion near a tower down, then just Distortion over the wall into tower range, throw a Sigil of Silence > Mimic into them and make sure to Distortion as fast as you can.