Manaweft Sliver and Sentinel Sliver aren't very good. I hear burning trees are.

You are missing out some very nice Slivers within Green/white. For example Harmonic Sliver is one of the best cards you could put in here. You then also have Gemhide Sliver over the Manaweft, it may cost one more, but will assist the tri-colour a lot more. Also, it is an expensive one, so it is not as aggressive, but Pulmonic Sliver could be a good idea :)

Delete my comment... You have made a standard... I fail XD

Yea, that is probably a good point on Burning-Tree Emissary , I'll remove the Manaweft Sliver . I think vigilance has it's uses, particularly in the aggro mirror matchup.

Hive Stirrings is a must

Yeah, I wanted all my slivers to bring something to the table, but I guess numbers is the name of the game here

But wait, this is not a standard deck :/

I do not is it is just because I am tired, but I am confused now O.o

It is standard, sorry if I'm confusing. I'm sort of thinking out loud about the best way to build this bad boy, I'm strongly considering putting Manaweft Sliver back in so I can ramp into Megantic Sliver . Thoughts?

its too bad Alchemist's Refuge and Yeva, Nature's Herald are going out because being able to cast slivers at instant speed would make some amazing combat tricks, esp if you had plenty of mana from manaweft.

Is there another way?

Savage Summoning

Yes, Savage Summoning could work.

With Farseek , Shocklands , and Manaweft Sliver , making this into a 5 colour deck isn't hard, and gives you access to two kickass sliver rares, Syphon Sliver and Galerider Sliver , giving all of your dudes evasion and lifelink will win games. Not to mention all the blue and black support you could add in.

check it out:

deck-large: the hivemind awakens

Run Mutavault and Door of Destinies

Regarding Mutavault , I am very hesitant to run colorless mana in a multi colored standard deck, I don't need the occasional other body that bad. I might add Door of Destinies later after more playtesting, but I feel like it is too slow at the moment.

Manaweft will most likely cover. Mutavault rules because it will count as a sliver. A number of opponents tend to forget it's on the board, which is an occasional added bonus.