Garthal, Phantom Champion

Undetected (Cannot be blocked or destroyed unless defending player controls an overseer)
When Garthal, Phantom Champion enters the battlefield, destroy target creature
{t}{b}: Create a 1/1 Phantom Warrior token onto the battlefield
{b}{b}{b}{b}: Search library for a card named Eternal Night and place it onto the battlefield
{t}{10}: Sacrafice Garthal, Phantom Champion: Exile all permanents your opponents control, deal as much damage as how much permanents they had on the battlefield.