I don't really have anything in my sideboard for shardless specifically either, but it does affect the weighting of various cards. For example, I could trim from 5 ramp cards in my SB to potentially 4. I'll have to give it some more thought. Shardless is one of the big matchups I like being able to go up to 4 DRS for though, because having DRS superiority or even parity in the match is extremely strong. Shardless has some of the worst mana in the format, they really rely on their DRS to smooth things out, so if you get DRS advantage you can often times just make their deck not function.
Edit:
Goldfished a few games with the BG build. I'm a fan, but there's still some adjustments to make. It's getting pretty consistent T5-T6 kills. Managed to T2 Nissa a couple times even. At a minimum it seems like it's a workable plan.
Really liking the Liliana. Steve into Liliana into regrowing Steve is pure value.
If anyone wants to try goldfishing it, here's my list on TappedOut
http://tappedout.net/mtg-decks/rock-fit-2/
It gets out of control fast. Tribe Elder puts in some major work.
As it turns out, Crop Rotation/Tireless Tracker is pretty absurd too. Works great with extra Vets as well. One play I've made a couple times is having a Tracker down, GSZ for a Vet, play the Vet, Crop Rotation for a Phyrexian Tower, tower the Vet, and gain 3 clue tokens while having 4 mana to use on them.
Edit again: Still no results other than goldfishing, but I'm liking the GB build. It's a good 2 turns faster than Junk SE Fit is while maintaining the parts of SE that I like.
Come to think of it, my hands have been SDT light and that could be a major speed component. I'll have a few hours to sit and ponder things tomorrow, so I'll give it some more thought then. Crop Rotation has been pretty amazing as a tutor and with a little setup you can essentially turn it into Ancestral Recall. With or without Tracker, in several games now I've used Crop Rotations to fetch up a Phyrexian Tower as a sac outlet for Veteran Explorer. It even leads into a reasonable 1 land opening of Forest/Vet, Rotation Forest for Tower, Tower Vet, fetch 2 lands, have XXBB available for mana, and 3 lands going into T3.