Personally I can't STAND Crystalline Sliver as it ruins several epic combo's like Fungus Sliver + Thorncaster Sliver for pump and of course Amoeboid Changeling + Sliver Overlord combo won't work with Shroud... Keep in mind you only have 2 or 3 sac outlets to remove Crystalline from play and if I'm against this deck, I will let it live as to keep you from sliver thief. Shadow Sliver is another one that I disagree with unless you KNOW you can win that turn and lets face it... you never know that for a certain. One Fog can ruin that.

On another note I see you skipped over a few fantastic slivers and I don't know why... Necrotic Sliver is PERFECT removal especially if you have queen as the commander since you can token poop. Pulmonic Sliver is the best sliver to keep what you want after board wipe effects, which happen often against us Horde lovers, and Frenetic Sliver is missing. Again, PERFECT for boardwipes and removal. Or even just blocking before it dies...

Heartstone is missing too. We all know the infinite sliver combo that requires either the Stone or Training grounds (with a mana sliver, haste sliver, and sliver queen). If you put in one more of the ability then you will be more likely to hit it when you need it. Speaking of infinite slivers Screeching Sliver is missing which can mill every opponent you have. With Intruder Alarm That can be all in the same turn you produce infinite tokens.

The deck has been updated in the meantime, really the only thing that hits it is mass removal.

Crystalline Sliver - good point there, haven't run much of the interaction combos, and rarely get spot removal from my enemies, but i notice the Thorncaster Sliver +Fungus Sliver now, good call

Shadow Sliver already removed

Necrotic Sliver acquiring thisPulmonic Sliver also

Screeching Sliver - already in the new version of the deckFrenetic Sliver - already in the new version of the deckHeartstone - already in the new version of the deck

and regarding Intruder Alarm - i fucking love this card, thank you for the excellent spot!

Armed and Dangerous ?

I'm sorry but i really don't see Armed / Dangerous doing a huge impact =\

Call to the Kindred?

Anything that puts some of them on the bottom of your library and filters slivers on top could quite possibly remove those few non-sliver cards that you really need and put them on bottom, and that hurts

Screeching Sliver+Basal Sliver+Sliver Queen+Fires of Yavimaya= Infinite mill