Rakdos Adventures: An aggro deck with a lot of reach and the potential to grind, but the manabase leaves a little to be desired
However the core strategy of the deck, walking the opponent into an expensive play, locking him with Winter Orb, and generating progressive tempo with Quirion Dryad on offense was compelling to the point of irresistibility
Granted, it's at sorcery speed instead of being able to do it on someone else's turn to start off a Storm combo with a bit of a boost, but in all likelihood it's still going to do more for you in a mono-black build than a simple Dark RitualDark Ritual will, for the same mana cost
It hits for 80 with 1 energy and energy gain, and the extra damage in return shouldnt be that much of a problem since your opponent probably wont overpower you at this stage of the game
Underground Sea is never going to cost you two life, while Watery Grave will some percent of the time