This build focuses on Sylvanas pushing abilities. Sylvanas can easily get away from danger using her haunting wave and if that isn't enough she still has bolt of the storm to resort to. Although this build focuses on pushing, Sylvanas still has a few tricks up her sleeve. She can use shadow dagger in combination with envenom to deal massive dammage over time. Blood for blood is a decent dammage dealer and it gives Sylvanas a bit more sustain. However if you feel like you don't need the extra bit of sustain you could swap blood for blood for cold embrace wich will help your team win team fights more easily.

While this may not be the most common build you see on Sylvanas i do find it does work rather well so i do recommend you try it at least once.