Unduba's Throne Room

You cannot lose the game for being unable to
draw a card from your library. When Unduba's
Throne Room comes into play, put your library
into your graveyard. At the draw step of each of
your turns, and whenever you draw a card
thereon in, put the top card of your graveyard
into your hand. Whenever a card that wasn't in
your graveyard goes into your graveyard, put that
card on the bottom of your graveyard.
{b}{b}{b}: Search your graveyard for a card, and
put it on top of your graveyard pile.