Oghma, Lord of Invention

Historic permanents you control have {t}: Draw
a card, then put this permanent on top of your
library.
When Oghma attacks, scry 4.
You may return Oghma from your graveyard to
your hand by exiling the top of your library until
you have exiled cards with mana value 8 or more.
Before anything exists, the idea must exist.