Sensei Golden-Tail

Oracle Text

Bushido 1 (Whenever this creature blocks or becomes blocked, it gets +1/+1 until end of turn.)

1W, T: Put a training counter on target creature. That creature gains bushido 1 and becomes a Samurai in addition to its other creature types. Activate this ability only any time you could cast a sorcery.

Card Rulings

12/1/2004 The training counter just marks which creatures have been changed; an effect that removes the counter doesn’t change the creature’s types or abilities.
12/1/2004 Note that multiple instances of the bushido ability each trigger separately.