i think is a good build.

You should sell your clown mask(forgot it's name) and buy a Rabadon's Deathcap and in order to make a guide,before starting it,learn as much BB coding as possible.

As mentioned previously by others, you will need to learn BBCode at the very least, as on Mobafire this is pretty much a requirement for any guide to succeed. I hope you'll find this useful. If you're still hung up on ideas feel free to check out mine for inspiration.

Good luck.

I play morde for very long time and i really think, you shouldnt use Greater Quintessence of Movement Speed and Ghost. This is why players prefer to use Flash! If you take flash, then you can buy magic penetration quintessence and deal more damage.
I dont force you to do this, but think about it... One summoner spell change and you can deal more damage = benefit!

I understand that you want as much magic penetration as possible but seriously, Haunting Guise is not a good item for late game no matter how you watch it, if you really want it you can get it early then sell it late for a Rabadon's Deathcap since I assure you that 140 AP and 30% boost to your ap will surely make you hit harder than with 25 AP and 20 magic penetration. In rest I consider that you should seriously work harder for this guide if you want it to be succesfull as it need so much more coding, images and why not some videos.

Neither. Sorry I forgot to change the title. My main focus is Magic Penetration when I play him. What I normally end up with is a bruiser dealing magic damage that seems to fare decently in top lane. I like to use it to even things out since given the majority of games I've been in lately, most of the junglers have been AD. So with a Magic damage bruiser along with the mid, there's a more even spread of damage.

Sorry about the lack of images. I just type what I learned so far.

All you have are texts, you need to add pictures, the build looks good though, but were you shooting for a tanky mord, or tanky ap mord just curious