Book Devourer

When this creature enter the battlefield and at
the start of each of you upkeep, exile the top 3
card of your library.
You may play cards that were exiled this turn as
if they were in your hand. For each card played
from exile, Book Devourer get -1/-1 until the end
of the turn.
"Best book in town! 5/5"
— Bhbhfft, Book's Digest