High Chancellor Namor

Flash. Hexproof, Lifelink, Vigilance, First Strike.
When High Chancellor Namor enters the battlefield or attacks, each opponent may sacrifice two permanents. If they don't, they lose 5 life and exile the top 10 cards of their library.
Sacrifice five permanents: Regenerate Namor.
{8}: Cast up to one sorcery card from each player's graveyard without paying it's mana cost.