Sellar, titan of finality

-When Sellar enters the battlefield, sacrifice it
unless it escaped
-Whenever Sellar the battlefield or attacks,
exile target permanent until Sellar leaves
the battlefield
-While Sellar is in your graveyard or on the
battlefield, create a 1/1 white spirit creature
token with flying whenever one or more cards
are exiled
-Escape-{w}{w}{w}{w}, exile six cards from among graveyards