Kuldaar, the Dread Market

When Kuldaar, the Dread Market enters the battlefield each player may search a library of their choice for a card and exile it face down.
Then each player shuffles their library.
{t}: Reveal a card that was exiled by Kuldaar. Players may pay any amount of life and the player who paid the most life may play it without paying its mana cost.
"Quaint."