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Slivers....nuff said.
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what?
hmm ... don't think prismatic omen makes your lands produce any-color-mana.
it makes them every basic land type, and since they are every basic land now they can produce all the land colors.
I think you will still need to put a certain amount of basic lands in your deck as opposed to 16 forests. You may get stuck with a lot of Slivers in your hand and not be able to play them b/c you only have forests as lands available.