I was trying to think of some new ways to have graveyard hate. I thought of how Leyline of the Void and Planar Void stop cards being put into the grave and how Tormods' crypt and coffin purge and others remove cards already in the graveyard. So I thought of combining the cards in a new, but fair, way. This is what I came up with:
CARDNAME
1

Enchantment
At the beginning of each player's upkeep, that player removes his or her graveyard from the game.
I dont think this is the best graveyard hate ever because it is worse at removing cards than tormod's crypt and it is worse than preventing new cards from getting into the grave than Leyline or Planar void. The advantage is that it happens every turn...but in between, the graveyard can be manipulated at will. Thoughts?
Portal to Darkness
1 
Enchantment
At the beginning of each player's upkeep, that player removes his or her graveyard from the game.