Hulking for cephalid + nomads gives you the ability to search for a further 3cc worth of creatures. The main advantage of the side is in the stern proctor, it bounces crypt+planar void (search for it when hulk goes to graveyard) and can be hardcast to bounce leyline or colosus/any artifact. If you're worried about extirpate then you can also run mesmeric fiend. The advantage over the sliver kill is that it doesn't lose to your opponent having critters. It also gives your opponent a false sense of security when they have crypt out. Yes, it sees the same hate, but has the answers, hence the unusual siding in reanimate to deal with graveyard hate.

I've been running the Kiki-Karma version main deck and then subbing in Cephalid illusionist, nomads en-kor, stern proctor, dread return, dragons breath, sutured Ghoul, hapless researcher. Mill your deck then return the Ghoul
You win most first games, then side out the Kiki-Karma kill and side in Cephalid+nomads along with the proctor and you can bounce their crypt or planar void, pithing needle hits carrion feeder which isn't in the deck now, or you can bounce the needle. The hapless researcher allows you to discard any peice of the combo.
It means there are two cards in the deck that you can't go off if you have them in hand, and both of which are easy to cast (playing one Tundra), you've sided in answers to crypt and planar void and the proctor can still be hardcast to bounce leyline. It runs two more slots then the sliver version and unlike the heart sliver you can cast eitheir of the two cards you don't want to draw, the ghoul can also trample over a colosus no worries. If extirpate is a problem then you can run meddling mage in the sidebaord as well, or Mesmeric Fiend and take a card before you go off.
That leaves 8 slots in my sideboard which is 3 CoV 4 leyline 1Echoing Truth
What do people think?
Was also wondering what people think about the possible addition of Timetwister to the deck. It has been working pretty well for me as if my combo peices have been countered or duressed I find myself tutoring for the twister and twistering rather than sitting tight until i draw into both peices.