I'm assuming you want the card advantage, but this is better because 1) any of your creatures dying triggers it, and 2) it doesn't cost you life
In this case, the changed land provides mana appropriate to the new land type
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If our Dinosaur friend, Colossal Dreadmaw, is blocked by Air Elemental, we can deal four damage to kill the Air Elemental and trample over for two more damage to the opponent
It's also one excellent example of an O-Ring: the wide assortment of (usually white) enchantments similar to Oblivion Ring from Lorwyn , that exile a target upon entering the battlefield and return the exiled permanent to the field if removed
(or lets say you have an army of 6/6 demons, then they all live!) The other card here is Mortarion, who is obviously a fan favorite