[QUOTE="God's Beard!";161361448]Being able to "fix" your mana by getting the color you need is everything when it comes to deckbuilding. So the reason it's so good is because rare lands like Wooded Foothills make it easier to play more than one color in a deck because you can cast your cards on time more consistently. So every red and green deck wants a full four of these in almost every case.
On top of that, there are two very relevant reasons why fetchlands(that let you "fetch" a land from your deck) are better than other rare lands:
1. With Courser of Kruphix out, you can shuffle away the bad cards you see on top of your library if you have a fetchland available. This gives you a random shot at getting a more important card based on the situation.
2. There are cards with the ability "delve" that lower their cost by removing cards from your graveyard. Fetches are a more or less "free" way of filling up your graveyard if you play with delve cards.
These extra functions of fetchlands vs other lands get even more important in older formats, making fetchlands the most powerful lands ever printed. Their value is inevitably going to go up over time, but honestly selling your foil as a new player to get the cards you want isn't a bad idea.[/QUOTE]
I don't know if fetchlands count as the most powerful lands ever printed since that's only even arguable when your deck also has ABU duals or shock lands.