One frontrunner is certainly Endurance, which is great against decks trying to exploit their graveyard
If a double-faced card is exiled face down or put onto the battlefield face down, keep its identity hidden by using the face-down substitute card or opaque card sleeves (or both)
The Meathook Massacre , Plague Belcher (also a Zombie to satisfy Gravecrawler's casting requirements), Rise of the Dread Marn , and the esteemed Liliana, Dreadhorde General will either win you the game, or put you in a game-winning position in conjunction with this combo
Monocolor decks can potentially generate a lot of mana to feed into it through mana doublers, but then theres the worry of having to lose that much life as well
1 I can't ever remember playing Barrenton Cragtreads, Glaciers, Hot Fix, Righteous Authority, and The Grand Calcutron
"The MODO Fiasco: Corporate Hubris and Magic Online"