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My entry into the Last Stand Deck Challenge. Use land search cards to get alot of lands out fast, use Prismatic Omen to turn them into all land types and then play Last Stand. By the time you do this, you should have enough "Swamps" out to make an opponent loose all his life (or a large portion of it at least).
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I don't really know this, but I think that prismatic omen only makes it other basic land types- meaning that they don't produce mana of any color.
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The rules state that if a land is of a basic land type (eg Island) it can produce mana of that type (eg blue mana). So the Omen turning all my lands into all basic land types so I can produce any of the 5 colours of mana. If you ever need help with rules on a specific case go to http://gatherer.wizards.com