Text (4th+errata): {2},{Tap}: Untap target attacking creature you control. Prevent all combat damage that would be dealt to and dealt by that creature this turn. [Oracle 2001/08/24]
This card only untaps the creature and makes it neither take nor deal damage. It is still attacking, however. [Duelist Magazine #5, Page 10]
Extended tournaments (see Rule 913) have banned this card since 1999/10/01.