egacy is a format well known for its nontraditional decklists that can be puzzling to read, and even more so to actually play. Gatecrash has added another interesting deck to the format—one that is capable of killing as early as turn one, and does so without using any lands.
Adam Prosak's All Spells
The key to this deck is that both Undercity Informer and Balustrade Spy mill the top card of your library until you hit a land, and if you don't have lands, well... it gets your whole deck. Under most circumstances, this would spell defeat, but not for this deck. It uses this opportunity to pull off the following combo:
To get the mana needed to get Undercity Informer or Balustrade Spy to actually mill your deck, Lotus Petal and Chrome Mox can get you started on black mana for Dark Ritual to ramp, and Summoner's Pact is able to get Elvish Spirit Guide to add a mana as well.
Finally, the sideboard. If your opponent is bringing in graveyard hate, this transformational sideboard lets you throw your opponent for a loop and turn into a subpar Goblin Charbelcher deck. Take out as many of the combo pieces as you can, and if your opponent plays a Leyline of the Void, smile and rattle off a few Rituals into a Goblin Charbelcher. If you activate it and reveal lands, but don't have any, it will simply deal damage equal to the number of cards in your library, which will be far more than twenty.