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Normally cards of the Common and Uncommon variety don't go for enough for it to be worth investigating their worth, but when getting into Rare and Mythic cards, especially if they're Foil or any other special variety of card there's a chance that they could be sold for a higher price

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That way, when youre at two Prizes, all you have to do is drop it down, Metal Links a few times, and then take a big snipe for the win

Youll have all this mana to work with and creatures to play but you wont have finishers

So they might be real, but they also might not be, and because of that a lot of people arent interested in them (as you have also noticed from the responses above thus far)