Unconditional black land destruction is hard to find (11 cards in total) and this is one of the best cards that does it. The ultimate black land destruction card will always be Sinkhole, but this makes a great substitute. When you compare this card to another black land destruction card, Maw of the Mire for example, it's obvious that black isn't the best colour to deal with lands, but the attempt was made with this card and it at least works. It your deck really needs black land destruction, you can't really do much better than this card (except Sinkhole of course... or maybe Rancid Earth).
Pros: Cheapish black land destruction
Cons: More expensive Sinkhole
Replacements: Sinkhole (if you've got $20 for each), Rancid Earth