Creature - Human Assassin 1/1, 1BB (3) {T}: Destroy target tapped creature. Trained in the arts of stealth, royal assassins choose their victims carefully, relying on timing and precision rather than brute force.
Illus. Mark Zug
If the creature is no longer tapped (it untaps by Twiddle or other effect) when the Assassin is resolved, then the ability is countered. [D'Angelo 2000/03/03]
You can target creatures you control. [bethmo 1994/05/01]
Cannot target itself because you choose the target at the same time you are tapping him. At that time he is not yet tapped. [D'Angelo 1995/07/18]
Extended tournaments (see Rule 803) banned this card from 1999/10/01 to 2005/08/20 because it was not in a legal set.
Note - This card was of creature type "Assassin" and not "Human Assassin" until Ninth Edition and Oracle 2005/08/01.