Mersilu, Tidecaller

Rejuvenate (Each card you put from your graveyard
to the bottom of your library while casting this spell
pays for {1})
{b/g}{b/g}, {t}: Reveal the top card of your library.
Add X mana of any color to your mana pool
where X is equal to the converted mana cost of
the top card of your library. Until end of turn,
you may play cards from the top of your library
as though they were in your hand and as though
they had flash.