Wander in the Graves

When Wander in the Graves enters the battlefield, shuffle your graveyard.
Play with the cards in your graveyard face down.
Whenever a card is put in your graveyard from anywhere, shuffle it into your graveyard instead.
At the beginning of your upkeep, reveal the top card of your graveyard and put it in your hand.
You lose life equal to it's converted mana cost.