Sapphire Prophet

Sapphire Prophet is blue.
{1}{u}{u}, Reveal Sapphire Prophet from your
hand: Reveal the top card of your library. If it shares a card type with a card you control in exile, you may cast that card without paying its mana cost. If you don't, draw that card instead. Activate this ability only anytime you could cast
a sorcery.
He offers the world to those believe in his existence.