Nystra, Titan of Life's Sway

When Nystra enters the battlefield, sacrifice it
unless it escaped.
Whenever Nystra enters the battlefield or
attacks, tap target permanent, until your
next turn, its activated abilities can't be activated,
and its triggered abilities can't be triggered.
Escape—{g}{g}{w}{w}, Exile five other cards from
your graveyard. (You may cast this card from your graveyard for its escape cost.)