I am not keen on the ability draft, some hero's are just so super op with certain combinations, it makes it no fun to play.
I played him a little earlier tonight, he is a fantastic mid hero, and works very well with hero's like Clockwork and Enigma, pretty much any hero that can trap a group of hero's for a couple of seconds.
Yip he was added recently
My standard build for him:
Urn of shadows
Tranquil Boots
Shiva's Guard
Heart or Radiance
He is heavily team focused though, so if you have a team that can initiate, you can swoop in, ulti during the battle and finish them with your beam. Works incredibly well.