Palkia, Render of Space

Flying
If you would draw a card instead exile the top
card of your library. If its an instant or sorcery
card, you may cast it as long as it remains exiled
and you may spend mana as though it were mana
of any color to cast it. Otherwise, put that card on
the bottom of your library in any order.
Instant and sorcery spells you cast from exile cost {1} less to cast.