That's the Purifier Artanis Skin from Heroes of the Storm, so you can guess who you are giving credits :)
Tbh, the skin looks nice but the detail from the psi-blades, as you realised, makes it be a bit "lower good-looking" than the standar Zealot we are used to.
Blizzard made it :P from Heroes of The Storm. Also you can use some effect inside SC2 to 'cover' the blade (because I agree with @TheSC2Maniac: Go ).
The problem with 'trying to fix the blade inside the hand while not attacking' is that you'll need to reanimate him (at least the walk and stand animation), but my suggestion with some visual effect in his hand, can make it work just fine if the effect cover all the blade area.