Disciple of Bolas
Magic 2013 — rare
Creature — Human Wizard
Disciple of Bolas rulings:
2020-08-07: If you control at least one other creature when the ability resolves, you must sacrifice one. If you don't control any other creatures at that time, the ability won't do anything.
2020-08-07: The creature's power as it last existed on the battlefield is the amount of life you gain and the number of cards you draw.