Fairly standard set. Why not run -speed nature so you can take special hits a bit better? Be ready to switch in Gengar a lot so you can absorb the explosions from Metagross and Bronzong.
There's nothing wrong with this set on the surface, HOWEVER, you'll be losing 25% from SR, + life orb recoil + sand storm damage. Standard DD Orbed Dos/Mence suck on sand teams for this very reason. Basically you need to ditch T-Tar or this.
In it's place? Hard to decide. You can slip in Scarf Flygon to revenge kill. This team would also greatly benefit from a Spinner, and for sand teams those are basically Donphan, Claydol, or Tentacruel.
Donphan is bulky, but is hurt by Toxic Spikes. Claydol levitates them away and Tentacruel ABSORBS them.
Claydol can also be used to set up screens (though it still wants Leftovers, so don't get any bright Light Clay ideas), and Tentacruel can Knock Off the incoming ghost's item. That's basically the difference.
Ok, this set is seriously all over the place. SD, or any non-Baton Passing Scizor, is one you want to keep in, so U-Turn is a poor choice. And no Bullet Punch? You're crazy. So, now that we've established that:
SD-Sub Scizor is your man. Seriously. Here's why:
Besides individual immunities, you've got no check on status. Sub will help block all that out.
Once behind a Sub, SD up a ridiculous amount of times so that even those that resist you will be hurtin.
If you choose anything but Brick Break, Heatran will laugh in your face, as will possibly other Scizors.
This is also an excellent Dusknoir counter as long as you stay away from Will O Wisp, since Sub blocks Pain Split. But it does NOT block Curse, so watch out for that.
Outrage on non-dragon = Give it Stone Edge.
Togekiss is fine.
Ok, this is confusing the hell out of me. It's like a combination of defensive sub and the sweeper.
I'd say just Specs this instead and forget abut subbing, since Scizor does it better.