My bad, didnt look at mana symbol rate... you are only running 2 colors... I really dont know slivers...
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I dont know too much about slivers but my five color deck land set up works well for me. you might look at it and see if it might be any good for you. http://www.mtgvault.com/ViewDeck.aspx?DeckID=105533
looks expensive
here is my 5 color ally http://www.mtgvault.com/ViewDeck.aspx?DeckID=105533 you may find my land setup works well
I like it, I love 5 color decks! and to get them to work effectivly is key, let me know what you think of mine http://www.mtgvault.com/ViewDeck.aspx?DeckID=105533
If you want you can look at my 5 color deck, the main problem with speed is the right color mana. My setup of land works really well. check it out, it is a little expensive but proxy it out and let me know what you think and if it makes your deck any faster. http://www.mtgvault.com/ViewDeck.aspx?DeckID=105533
What about Hauting Echos?
Looks like it works well, I like how it doesnt recognize your artifactland as land. I wish now that scars of mirrodin is out that "open the vaults" was still type 2.
Now thats scars of mirrodin is out you should put some of the blue cards with proliferate in, and you could put "Knight Exemplar" since you seem to have a good hand full of knights.
I like it, looks like a tough one to beat.