Underground Sea, for example, can sell for as much as the cheapest Power Nine card
When people think of fast mana, they generally refer to artifacts, but specific lands are also capable of getting you ahead of your mana curve
Theres no chaff or filler, just an island surrounded by the ocean blue, or a mountain with a totally red sky

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In a world of terror, lightning bolt and swords to plowshares, I really can't imagine it being that big a problem
Most white decks are hungry for lands and cards because developing your mana and your hand at the same time isnt something theyre well suited to