Why isn't there a Vietnam Karthus skin?

Seems a no-brainer to me, replace his staff with a mine detector and his book with a radio, make him look like the screaming vietnam skeletons from that one old movie (I don't remember the name, maybe it was "Heavy Metal") His skills could be: Q- skittles re-skinned as landmines W- change the wall into spectral barbed wire (spooky) E- just napalm or fire swirling around him R- change the casting animation to Karthus screaming into his giant radio like a madman and change the nebulous magic that hits the enemy team to mortar fire hitting them or something.