Judge Magister

{b}{b}, discard a card: Exile Judge Magister and
choose an opponent and target creature or planes-
walker they control.
At the beginning of chosen opponent's upkeep, if
Judge Magister is in exile and they control a
permanent chosen by it, they must sacrifice a
permanent. When that opponent controls no
permanents chosen with Judge Magister, return
it to the battlefield tapped if it's in exile.