Need advice on land destruction deck... (RUB)

A few thoughts:

1) As you already identified, this isn't really the best strategy out there in standard.  It'd be great fun if you get it to work, but I don't know how likely that is.

2) I would load up on the cheaper land destroy spells rather than the high-end CMCs.  Specifically, Scorch the Fields, Survey the Wreckage, Into the Maw of Hell, and Rite of Ruin could potentially be dropped.  They're expensive and really don't give you the best payoff.  The only real reason I didn't mention the others is because they're cheaper and, in the case of Maw of the Mire and Destroy the Evidence you get more than just land destruction out of it.  Maw gives you life gain, which I think will be essential to staying alive long enough to really get anywhere.  DtE actually will end up netting you two lands in their yard.

3) I'd suggest adding some mill stuff with the "Until you hit a land" effects, i.e., Consuming Aberration/Balustrade Spy/Trepanation Blade.  They'll cost the opponent lands AND other stuff.  The aberration also provides you another possible win-con in the process.

4) I would DEFINITELY run 4x Ghost Quarter given the prevalence of the shocklands.  Several people aren't even running any basics at all these days.

5) I would try to reduce it to 2-3 colors ideally to ensure that the ironic event where you're land-screwed doesn't happen.

6) I would also suggest some more removal as you're currently only sitting at six options.  I fear you will find many instances where you need to deal with some added creature(s) and just run out of firepower.

7) I'm not sure your three artifacts really benefit you much.  The only one I'm seeing as that useful is the Gem of Becoming and you would be much better served by Gilded Lotus.

8) Don't forget that simply tapping their lands and keeping them tapped could serve the same purpose as destroying the lands in many instances.  I'm thinking specifically about Tamiyo, the Moon Sage, but anything that lets you "tap target permanent" could do the same thing.

9) I would actually suggest going with Jund colors (RBG) to give you more ramp options with green while also adding Acidic Slime to the mix.  Toss in a Conjurer's Closet and said slime will destroy at least one land per turn with no added cost.

10) Dual Casting could be of considerable use to you, pending that you find a good creature to put it on.

Anyway, I wish you the best of luck with it, but I fear many of your efforts will be wasted as I just don't see how it will be competitive.

You might consider running effects that destroy permanents instead of specifically mentioning lands.  If you can clear out someone's creatures then they'll just be left sacrificing land to something like Undercity Plague.  You could consider running Rakdos Keyrune or Dimir Keyrune as insta-creatures that would survive sweepers.  Then you could run Mutilate or something similar and your guys would be safe.  You can cipher cards onto the Keyrunes, and the cipher ability will stick around even when the Keyrune isn't a creature.

I'd also consider Smallpox if you're not constrained to Standard-legal cards.