Well, this is the way I usually play Morde, but of course you can make some changes for playing him in a more comfortable way! But, I would recommend you the first one, because, you don´t do a lot of damage, but you resist in lane and teamfights a lot, so it will be very difficult to the enemy team to kill you if they dont focus on you, which will let your mates to kill them because Morde is really hard to kill, also, you will do a nice damage, but of course, these are the three ways I´ve played him and for me, the most effective is the first, but if you want to be a Deletekaiser, I would definetely recommend the third one.

I really like this guide. My favorite is the third one. But i would think about changing runes, for example magic pene marks, hp seals, ap glyphs and ap quint. ofc +