AEther Vial is either 4 or 0. You want it turn 1. Any turn past that and its MUCH less useful. I'd drop Mirror Entity to 2 for an additional AEther Vial. Hell, since you're running 4x Adaptive Automaton you really don't even need Mirror Entity anyways. You don't have ramp, with the exception of AEther Vial and Manaweft Sliver. Neither of which will help with Mirror Entity's ability. You have to tap the creatures you would like to attack with for mana to really get any advantage from it and that is counter productive. I'd drop Mirror Entity for an additional Galerider Sliver, Manaweft Sliver, and AEther Vial. That will make your curve for AEther Vial better anyways.

I had a sliver deck that ran Mirror Entity and Manaweft Sliver too, and i think Sentinel Sliver is a good adition to the deck because you can declare attackers and still use your creatures for mana. i usually gave me around 4-6 more mana for mirror

4x Horizon Canopy would also be an excellent investment for games that go a little longer. Being able to trade a land for a draw is very powerful in the mid-late game.

3 Mirror Entity is too many, IMO. Trim that to 2 and bring in the 4th Manaweft Sliver, which is the reason Entity works in your deck in the first place. I'm also not a fan of only having 3 Galerider Sliver, since it's absolutely critical that you draw it in order to get off to a fast start and have the evasion to close games out. Saljen is also correct in that AEther Vial is a 4-or-0 proposition.

rothgar13 Saljen Fo_ryou, i want to think yall for all the input and i've made some changes. i upped AEther Vial to a 4 of, i also added Sentinel Sliver over Diffusion Sliver to go more aggressive thanks to its incredible synergies with Manaweft Sliver and Mirror Entity. but i disagree with dropping mirror to a two of, i use him as a mana dump and normally after he hits i'm swinging for 20+ damage, and manaweft is in there simply to hit Collected Company as early as possible, but the added synergies is almost broken. also Horizon Canopy as a 4 of would be nice but im trying to keep it as budget as possible.