LeblancMatchups

Abuse his extremely weak early lane by constantly pushing for wave priority, and once he gains enough ranks to sustain a push, dedicate your W (Distortion) usage specifically to instantly clearing his Voidlings, thereby preventing him from pushing the wave into you and ensuring you maintain priority to roam, and strongly consider building Quicksilver Sash (QSS) by the mid-game to fully negate his R ultimate threat. When trading, always use a quick auto or Q to proc his Passive Shield first, enabling your main burst abilities to deal full damage.

Prioritize maintaining high HP by constantly tethring and dodging her Q, and when executing your engage, use the Double Distortion combo (RW-W) to enter and exit quickly, or commit to a full burst knowing that the RW-W mobility provides an unpredictable path that can be timed to dodge her self-peel E. Since Syndra wins long-range poke battles, use your W not just for offense, but also defensively to avoid her damage, and be mindful that you want to avoid trading when she has full passive stacks, aiming instead to hit her when she has no potions or resources to sustain the pressure you apply.