Lasos, Titan of Life's Discord

When Lasos enters the battlefield, sacrifice it
unless it escaped.
Whenever Lasos enters the battlefield or attacks,
each opponent loses life for each creature card in
their graveyard. You gain life equal to the life lost
this way.
Escape - {w}{w}{b}{b}, Exile five other cards from
your graveyard. (You may cast this card from your graveyard for its escape cost. )