Cad Bane

Whenever you cast a card you do not own, create
a spice token and gain 2 life.
Pay 5 life and sacrifice a treasure: untap Cad
Bane.You may only use this ability once per turn.
{u}{b}{u/b}, {t}: look at the top three cards of target opponent's library. Exile one of them face down,
then put the rest on the bottom of their library.
You may look at and cast that card for as long as
it remains exiled and you may spend mana as
though it were mana of any type to cast it.