thing is,that undead dude with magic sword doesn't sound so special.
I mean technically you could already say that riven has a magical sword.
It may not shoot laser,but it is still filled with magic.
When doing a champ you need to make him/her unique.
That means give him a unique personality,a unique playstyle and a unique core concept.
Magic sword guy would be the core concept,but not unique,as Riven has this too.
There are still some basic types of undeads that are not really represented here(like a skeletal beast,a real vampire,a ghost or banshee,a death knight,etc.,but those all sound like the stuff for tanks,bruisers or magical champs)
You know, the only thing keeping me from saying "ranged sword fighter" is Kayle because she has her ability to let her attack at range, BUT!!!
If he naturally attacks at range using his sword would be awesome. And, I don't know any marksman who, say, has their own built in lifesteal.
Which means, he can sustain himself in lane without actually buying the Vampiric Scepter or cutlass. That, would be pretty cool (Though that Bork would make it cray-cray)
Be interesting though because if not done right, he'll appear more like a mage than a marksman, but meh. I'm not a core designer. But, hey. It makes enough sense, right? IT'd explain why Bork is a sought after pick for some marksmen.