I love how you've implemented
Cavern Of Souls,
Unclaimed Territory, and
Sliver Hive, making it so that you have plenty of lands that can be tapped for any color of mana. I also like the use if
Descendants' Path and how it ties together the fact that its a sliver tribal deck. But I noticed that you have multiple slivers that deal with sacking your creatures for damage or mana or because of losing a coin flip, and I was wondering if maybe
Pulmonic Sliver might be a good addition to the deck so that all sacked slivers go back on top of the library. And since you already have
Descendants' Path, this would allow you to cast them for free. and if you used this mechanic with
Door Of Destinies, it would allow you to
charge it up past the amount of creatures in your deck very easily.