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http://www.starcitygames.com/magic/legacy/21524_The_Long_And_Winding_Road_Legacy_Elves.html
All the spells in that deck are green as are all the creatures. And yet the deck has two fetch lands - Misty Rainforests - which fetches islands and forests - and Verdant Catacombs - which fetches forests and swamps.
Some of the cards in the sideboard are blue and black I note. My guess: basic lands can be swapped out without needing to live in your sideboard?
You cannot swap in basic lands during a match or tournament in constructed unless they are part of your sideboard.
The fetch lands are in the deck to filter the lands as soon as possible. They only fetch forests in this deck. When you fetch a forest, there are less cards in your deck, so the chance of drawing a card you want (not a land usually) is bigger.
The black and blue cards in the sideboard are traps, they can be played for free in certain circumstances, so therefore you need no black or blue mana.
