Demothraug, Unruly Avatar

Trample, Flying, Haste
When you cast Demothraug, Unruly Avatar you
lose half your life total rounded up, mill the top
half of your library rounded up and at the start
of your next turn you lose the game.
Demothraug, Unruly Avatar's power is equal to
target opponent's life total. If an opponent dies
before your next turn, postpone losing the
game for one turn.