Look at all this GHOSTINESS
http://pre00.deviantart.net/7b64/th/pre/i/2013/021/8/b/mordekaiser_by_michalivan-d5s9q6h.jpg
I can really see the appeal to Mordekaiser. His mastery of metal spooky ghost hokum and deadly shrapnel blue mist flying out at people. Not to mention his giant metal ghost mace and the suit of armor his soul is confined to his ghost armor that covers up the spooky skellington inside, but don't tell China about the skellington
You're right, Riot; Mordekaiser really makes no sense being a metal mage.
My hat's off to you, sir or madam.