Necromantic Conquest

{t} add: {b}{b} to your mana pool, if there are any cards in your graveyard on your next upkeep you lose the game.
Exile a zombie you control: Exile your graveyard.
"You know between all the summoning of unholy leigons and salting the earth of the common folk I might have lost sight of why I wanted this in the first place" - grimoire of Archlitch Greg the regretful