Pilfer Documents

Exile the top card of target opponent's library
face down. For as long as that card remains
exiled, you may look at it, you may cast it if it's a noncreature, nonplaneswalker spell, and you may
spend mana as though it were mana of any type
to cast that spell.
Cipher
"You've got so many old books in here, surely you
won't mind if I 'borrow' one or two."