Enter the Underworld

(You may cast a legendary sorcery only if you control
a legendary creature or planeswalker.)
Draft Enter the Underworld face up.
All players involved in the draft play a Magic:
the Gathering subgame, using their libraries as
their decks under the table you are all playing on.
If you are not playing on a table, find one to play
under. Each player who doesn't win their
subgame loses half their life, rounded up.