Archfiend of Despair

Erzdämon der Verzweiflung (Archfiend of Despair) (de)

Creature - Demon | Power/Toughness: 6 / 6 (CMC 8)
Flying
Your opponents can't gain life.
At the beginning of each end step, each opponent loses life equal to the life that player lost this turn. (Damage causes loss of life.)