Text (CH/5th+errata): {3}: Target creature doesn't untap during its controller's next untap step. [Oracle 1999/07/23]
Does not prevent a creature from untapping during the upkeep step. It just stops the "normal" untap during the untap step. [D'Angelo 1999/08/01]
Affects the next untap of that creature for whoever controls it at that time. In other words, the effect does not remember the current controller. [bethmo 1996/11/27]
