Once the SCG order arrives, I should be able to build this out and use it - I'm skeptical that it will be a consistent or overpowering deck or anything like that but getting a win with it doesn't seem impossible. Adding ramp has a double benefit - not only does it make Myrkul possible as early as turn 4, but Nyxbloom would also be possible that fast and having that online speeds everything up immensely. One thing that I've found with the way I tend to play Magic is that I am really bad about leaving mana open - which means I'm going to struggle to pilot Vadrik well. :P Having the ability to respond in some way to pre-Myrkul boardwipes is probably going to be pretty important.

Most of the Myrkul lists I saw on MTGGoldfish were kind of Abzan goodstuff builds, where the super-expensive decks were super-expensive because they included all of the token doublers and a bunch of expensive lands, too. No one else was going for Gates - weird. I'm happy with the fact, then, that I won't be playing a stock Myrkul build; it's not a super-budget version but it's not blinged out either. And it takes a different tactic when it comes to winning - even as regards Devo combos. Might not be the smartest or most effective method but that's probably the way I'd like it to be anyway.

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Did some reading about Myrkul and found that there are LOADS of decks trying to abuse Devoted Druid, so that's a little bit less fun. However, if you can find a way to animate a Planeswalker you get enchantments with loyalty abilities, which sounds weird and like a hoot. (Apparently you can also use manifest abilities, since the creature dies, goes to the graveyard (now face up as a PW), and is then exiled and a copy is made. Myrkul is a thief, taking big chunks out of all these other decks. Kadena might have to go on the shelf for a bit.)

The manifest - PW plan needs to be a down-the-road update; it's a strategy that will take some work and card-sourcing and I'm not at the point of waiting until it all comes together. Just want to play!

As usual, this deck is at the point of trying to do several things (I'm adding in the Gates from Go-Shintai just for lulz) and will probably fail at all of them when all is said and done. That being said I think I'll poke around and see if GMR has a copy of Luxior. If not, I've got to get that SCG order in for Halo Fountain and the like anyway.

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I'm dismantling Go-Shintai as soon as the next batch of cards is secured - that should give enough pieces to go forward with for Myrkul.  I'm considering the possibility of incorporating the compatible Shrines just to maximize the Enchantress effects, and I'll need to put as much ramp as I can fit in because Myrkul is expensive af. I would imagine there's a bit of a delicate balance between ramp, enchantments, and creatures that benefit from Myrkul's effect (and boardwipes, can't forget those).

In the short-term it seems like a decent idea to make use of mana dorks and the like that can get Myrkul online as fast as possible.

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I made a deck with Myrkul as the commander in Forge and I think I even exported the deck list to see if Paul had any of the cards hanging around; it seems like such a wonky and weird deck that I would absolutely love playing it.
List has been imported and pruned a little (Serra's Sanctum? I mean come on) to make the deck more reasonable.
How the deck is supposed to work: do what you can to ramp up until you can get Myrkul out, then boardwipe (there are many in here). Whatever creatures you have out should turn into enchantments and stick around; if you happen to have Bastion Protector or some other way to make Myrkul survive the wipe you'll be golden.
Once that has all been accomplished, dig around for one of the Defiant Bloodlord-style effects and start gaining as much life as you can (and hit the opponents while you're at it).
It wasn't spectacularly effective in Forge playing head-up against the AI, but I definitely enjoyed getting it online when I could. I'll keep working on this decklist and poke around EDHRec to see if there are new toys for it.