User blog comment:ChaseKing/Counter for Leblanc finally found???/@comment-25267058-20150605062724

Gallio. You can pretty much just build full MR against her and his passive will allow you to outdamage her. Veil, Visage, perhaps a Rod of Ages, and if you want to be a real dick, grab a Liandry's. Your ult will lock her down and do metric shitloads of damage, and she's so damn squishy you might even one-shot her if there are a couple of enemies caught in the ult with her.