Pawa, the Omniscient

Observer (This creature cannot attack or block and cannot be the target of spells or abilities.)
{1}{w}{u}{b}, {t}: Choose a nonland permanent. All players may choose Judgement or Mercy. If more players choose Judgement over Mercy, exile that permanent. If more players choose Mercy over Judgement, put that permanent on the top of its owner's library. Otherwise untap Pawa, the Omniscient.