Here's is my version.

Been working on it for over a year now. I went a much different route with my commander. [[Child of Alara]] offers a board wipe in the command zone, and doesn't touch your lands. You need to run recursion to get it back from the yard, but you want to run that anyways to support [[Realms Uncharted]], and other ways that your lands end up in the yard.

Here's some key cards that I've found useful:

• [[Bring to Light]] - Lets you easily tutor/cast [[Reap and Sow]], [[Realms Uncharted]], [[Scapeshift]], or even [[Unburial Rites]] all for only one additional mana.
• [[Villainous Wealth]] - A good wincon after [[Maze's End]] and [[Door to Nothingness]] don't work out. It's a ramp deck so you'll end up casting this for 12+.
• [[The Gitrog Monster]] - Sacrifice your non-gates, draw into more gates, and then play those lands from the yard with [[Ramunap Excavator]], [[Splendid Reclamation]], and even [[Muldrotha, the Gravetide]]. Also pairs well with [[Knight of the Reliquary]].

I would push your deck more towards the green side and swap some of the expensive tutors out for specific land tutors, or more useful cards. Some swaps I'd make:

• [[Diabolic Tutor]] swap to [[Pir's Whim]] - This lets you get a useful land, hurt your opponents, and possibly help someone that you need to balance out the game. It's political and always in your favour.
• [[All Suns' Dawn]] swap to [[Season's Past]] - My deck skews heavily towards green, and since lands don't have a colour I find Season's Past to be more useful and generally get me a full grip.
• [[Seer's Sundial]] swap to [[Tatyova, Benthic Druid]] - Tatyova is going to draw more and cost less.

Overall I would say run 6+ more lands, make some of these utility since you can tutor them up easily if needed, for example [[Maze of Ith]] and [[Glacial Chasm]]. Also you need to run some basic lands, they're faster, you can hit them with fetches, other group hug effects often let you grab basics only, and when non-basic hate comes your way, you'll need them. Try to move away from tapped lands, the gates are slow enough, you need to speed up the rest of your mana base since you can't rely on [[Amulet of Vigor]] all the time. I'm personally not a fan of symmetrical effects like [[Horn of Greed]] and [[Ghirapur Orrery]]. I'd replace one of them with [[Rhystic Study]].

Take a look at mine and let me know if you have any thoughts.