Thruax, Unholy Tomb

When Thruax, Unholy Tomb enters the battlefield, put all cards from your library into
your graveyard.
As long Thruax, Unholy Tomb is in play you
can't draw cards.
When Thruax, Unholy Tomb leaves play, put all
cards from your graveyard into your library.
At upkeep you can pick a card from your
graveyard and put that card into your hand.
{t}{b/g}{b/g} : Put a permanent card from your
graveyard into play.