Dethrone

(You may only cast a legendary Sorcery if you control
a legendary creature or plainswalker)
Will of the council- Starting with you, each player
votes for Execution or Upserping, if Execution
gets more votes, Each opponent sacrifices his/her commander. If Upserping Gets more votes or the
vote ties, you become the monarch and gain life
until you have the most life among all opponents.