The Book of the Eight

Demon spells you cast cost {8} less to cast.
{p/b}{p/b}{p/b}{p/b}{p/b}{p/b}{p/b}{p/b}, Exile The Book of the Eight: Search your library for up to eight Demon
creature cards with different names, put them
into your hand, then shuffle. Until end of turn,
Demon spells you cast cost {8} less to cast.
"A tome bound in black leather lies open on a lectern,
its pages covered in spidery glyphs."