Creature of the Deep

Whenever Creature of the Deep attacks, Exile
the top five cards of target opponent's library,
until end of turn you may cast any of those
cards from exile, and you may spend mana as
though it were mana of any color to cast it.
Eldritch (You may cast this card from your
graveyard by sacrificing one creatures and
paying {3}{b}{b}. Activate this ability only any
time you could cast a sorcery.)