Ryze is already added in the matchups. I've barely had any games against Aurora so I can't really comment on that one yet. As for the fun build: this guide is mostly about the best possible build for Mordekaiser in SoloQ. For-Fun builds are very subjective so I don't think they have a place in this guide.

Since when? I've made the experience that you only fly until you hit Brazil wall. No flying out

Very happy to have been able to help you, and thanks for the feedback! Regarding your question, it's really not that big of a deal. The idea behind the attack speed vs. ability haste shard is mainly that you benefit slightly more from attack speed when building Riftmaker since you have more ap and thus your autos deal more damage. Ability haste is better on Jak'Sho mainly because you get to press W more often. If I'm being honest, the only real difference I have felt so far between both shards is that you will have an easier time last-hitting minions in the laning phase if you go for the attack speed shard. Ultimately, you shouldn't blindly follow everything my guide, or any guide for that matter, says. Not everything here is perfect, of course that isn't to say I didn't put alot of effort into it. This is just all the experience I gathered from playing Morde for over 1000 games, and if you like this build/playstyle, then great! If some detail or item feels off, then don't feel forced to build it anyway just because my guide says so. I guess what I'm trying to say is: have fun and don't think too much about what's good and what's not.

Jak'sho is usually the best mythic to go right now. Only build Riftmaker if the enemy team has 3 or more tanky champions.

I played the Darius vs. Mordekaiser matchup countless times from both sides and can confidently say it's overall a skill match-up that's in Darius' favor early game, then in Mordekaiser's favor in the mid game and finally slightly in the favor of Darius in the late game again, although it heavily depends on the rest of his and your team. Whoever wins lane is usually decided by how well the players know their champion's limits. Good players constantly know who would win in an all-out fight and play accordingly.

I'll try it but stats say it sucks. Lower pickrate and winrate than Riftmaker and Jak'Sho. So far I've only really built it a few times vs. Tryndamere or a full ad comp. Maybe it works better in lower elos but I don't really like it that much.

It's a good niche pick against some of the melee mid laners such as Katarina or Sylas but I almost never play him mid because I don't like laning vs. mages, although you can make some of the mage match-ups work with a Rylai's rush.

Yes, absolutely. Jak'Sho got nerfed for builds where it's the only tank item. If you build Jak'Sho on Mordekaiser, you're going to want to follow it up with even more tank items, such as Sunfire, Randuin's, Spirit Visage, and so on. This gives you a ton of bonus resists and, if you look at the new Jak'Sho, you will see that the ratio for the bonus resists got increased, so this "nerf" does not affect the tank build on Mordekaiser at all.