The Imposter

When The Imposter enters, you secretly choose a nontoken creature you don't control and this creature phases out. If The Imposter or the secretly chosen creature leaves the battlefield, reveal it.

Will of the council — At the beggining of your upkeep, starting with you, each player may vote for a nontoken creature you don’t control. Sacrifice each creature with the most votes. Then sacrifice The Imposter. If the secrectly chosen creature is on the battlefield, The Imposter phases out a