I would consider getting the shock land Sacred Foundry , it took a dive in price due to its anticipated appearance in the new ravnica set. You also can fetch for them with the Arid Mesa. Other than that, brilliant deck!
Isochron Scepter makes for some of the worst experiences I have EVER had in any games and just to give you an idea how much I hate it, the second card on that list is Gwafa Hazid, Profiteer ..... +1 and that whole thing. disgusted look at Scepter.
Awesome deck, totally lockdown. Finally someone who uses Silence , it's a really great and underrated card indeed. Found it kinda strange to find Isochron Scepter in a red/white deck, but it sure seems to do the trick nicely.
For artifact destroyer, you might as well sideboard Shattering Spree , it's just.. horrifying for every artifact deck and will not be too much for just 1 artifact. If you like more versatility, Revoke Existence is the very best choice.
Anyways, Good job!
I do like this deck, and I have always wanted to try something like this.
But all I can do is cringe when I see the 4 Ghost Quarter in there.
But that is just my opinion. Do you own the cards, and have you assessed the local meta-game?