Why so many use Q+R+W+E combo X.X does it mark opponent with 2 marks or sth???
Cuz if it doesn't then its kinda pointless don't u think? cuz after u have done Q+W+E then ur Q is off from CD and u can anyways do it again :/
Btw ppl suggest me to use Q+E+W cuz well immobilizing them is quite a nice thing to do o.O what u think?

Rylai's Crystal Scepter doesn't offer any sustain.
RoA does.

Rylai's Crystal Scepter is best on all AP Carries that aren't mana hungry throughout game (ex. Swain, Kassadin, Anivia) then you take Rod of Ages instead.

If you ask me, LeBlanc without at least 1 health item = trashblanc.
Also, Doran's Ring(s) start = 0 sustain = lost lane.
lost lane = lower cs, lower cs = no money, no money = no items, no items = no damage, no damage = no kills, no kills = no soulstealer stacks, no soulstealer stacks = no mid/late power, no mid/late power = useless LeBlanc, useless LeBlanc = 4v5, 4v5 in 75% of cases = lost game.

Yes, pro's do Doran's Rings on her, but they play too ****ing well to lose the lane under any circumstances. People at 1200 tend to grab a Doran's Ring and then after they fail early game, they whine about anything, but their own low skill level.

Gee, that was one long thoughts thread :D
My point is, LeBlanc isn't that dependable on early AP, but something like catalyst the protector makes for a great laning item.

+idk about all the theory crafting, but I've played 3 LB vs. LB games in which my opponent went 3 doran's and I've won all 3 matchups with extreme ease.

If u ask me it's not so bad (other then the Mejai's Soulstealer rushing but ok) o_O

To be honest, this build is so not viable...
Not speaking of fun that you will have when you got all the stacks by getting fed :D That's a fun part.

But in said reality, with this, you don't have anything but burst damage.
And there are infinitely many counters to burst damage.

I'll name you some of them :)

• Banshee's Veil. In my experience, this thing kills LeBlanc in general, but if you don't have any survivability to stay around for couple of bursts, this will turn you into a useless champ.
• Galio, Talon, Kassadin, Ryze, Wit's End, Hexdrinker& Abyssal Mask built Twisted Fate. The second, one of these will appear in your lane, you will curse that day :D :D They can just dominate the lane without any threat for themselves.
• Nether Grasp/ Infinite Duress. ~2 seconds is enough to focus down 1700 hp LeBlanc without any resists ( Zhonya's Hourglass comes as one of the last items, so I don't count that in)
• primodrial burst HUEHUEHUEHUEHUEHUE, keep building AP ^^
  
  I used to play her like this until I realized that this type of LeBlanc is 0 threat to any more or less good team that doesn't lack common sense about how to play League :D
  
  I really suggest that you think around the build and make it a little bit more competitive :) Till then, goodbye, my friend.
  
  If you have any questions/arguments, you are more then welcome to PM me :)