Barren Moor lets you cycle it for B, does come in tapped though. But works well in mono black for thinning and drawing. Plus its common and costs less.
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What are the Marsh Flats for?
Playing through an entire deck in a single turn is always fun. Biggest kill(s) I've had with my Elf deck: Drew my entire library, dropped them into play for free with Aluren, Fires gave all my creatures haste, Fireballed one player, Tribal Unity and attacked another one, sacrificed all my creatures to Goblin Bombardment to kill another one, brought everything back out again using Yagmoth's Will, Milled another player using Laquatus, and then sacked again to Goblin bombardment for a fifth kill. And now when I play my Elf deck it becomes me vs everyone.
http://www.mtgvault.com/ViewDeck.aspx?DeckID=382367 A Vintage Elf deck.