Ok so its not fully slivers. Yes this bothers me, but honestly I dont think its possible to make a deck thats viable in standard with just sliver creatures. At least not right now.
Here is the concept and reasoning for the cards. I have not yet tested this deck so ill try and update this as I play with it and see if its viable at all. Please feel free to chime in with any opinions or helpful comments.
Basically Obelisk of Urd is a core card of this deck. You need to play this card every game. It makes your 1/1 and 2/2 slivers viable to attack. Also Abzan Ascendancy helps here and has the added bonus of making 1/1 flyers if they take down a sliver.
Murderous Cut is really a cool card for removal in the format. Since we got a lot of small creatures and should be attacking with them to get the benefit from Leeching Sliver we will most likely have some graveyard built up. The more we loose the more powerful this card gets. To be seen how good it is with slivers in this deck, but I think it has potential.
The Jeskai Charm and Temur Charm are both pretty useful here too with Jeskai Charm giving you more removal or optional lifelink and a 1/1 this can help you avoid loosing your precious slivers to a larger creature. Temur Charm can also give you a 1/1 + the ability to choose your target to dispose of. It also can do the job of Diffusion Sliver or clear some room for your attacks. I really like the charms in Khans.
Whip of Erebos I feel like this card really doesnt need to be talked about anymore. It gives you lifelink and in a mana world with pain lands thats pretty cool. But obviously the secondary ability can be really powerful if you loose an important piece of your win condition.
Elvish Mystic and Sylvan Caryatid for mana ramp.
Diffusion Sliver for protection... ish... good against control.
Venom Sliver is a decent deterrent with deathtouch and makes people question attacking you with things they dont want to lose.
Belligerent Sliver lets you break through their ranks.
Leeching Sliver is pretty strong here. I think this card is stronger than it seems. When all your slivers just need to attack to deal 1 damage to the opponent it only takes a couple turns to deal some serious damage in standard with an attacking force of slivers (Especially if Belligerent Sliver has done his job or you happen to be flying or industructable...
There are a few possible win conditions here. If you can get out the Sliver Hivelord well... then you are indestructable so you are a little tough to kill. Archetype of Imagination is basically a combination of the much missed Galerider Sliver used to get in some shots with our 1/1's and 2/2's that would typically be blocked and protection as it stops the opponent from flying too so you force an advantage. Flying Crane Technique is basically the same but with the added bonus of being a replacement for Bonescythe Sliver for a turn. Not sure how playable this card is yet due to the high mana costs, but I like the idea of it.
And just in case you dont have enough slivers then feel free to call on the Sliver Hive to make some more for you. With Leeching Sliver in play the more of these guys the better. And if you happen to have everything else set up then you are making 4/4 slivers with deathtouch, lifelink, and a straight shot to your opponents health. Oh and they do an extra damage to player so really 5/4. All that for 5 colorless mana is pretty cool. Throw in a charm and thats now a 6/5 token creature. Not that you will be able to do that... well ever probably but how cool would that be right?
Lands are a little haphazard I will admit. Mostly because I chose cards I already had, but I think its workable this way. May not be 100% optimal. Feel free to throw more money at it and make it better.
