Tragedy of Darth Plagueis

When this Enchantment enters the
battlefield, exile cards from the top of your
library until you exile a Sith card. Put that card
onto the battlefield tapped. Put the exiled cards on
the bottom of your library, then, shuffle your
library.
You Don't lose the game for having 0 or less life.
For the rest of the game if you don't control any
Sith creatures, you lose the game.