Rasan, Titan of Mind's Horrors

When Rasan enters the battlfield, sacrifice it unless it escaped.
Whenever Rasan enters the battlefield or attacks, defending player mills four cards. Choose up to one card in that player's graveyard and exile it. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast it.
Escape—{u}{u}{b}{b}, Exile five other cards from your graveyard.