Knight of the Holy Nimbus [TSR-23]

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) If Knight of the Holy Nimbus would be destroyed, regenerate it. (Tap it, remove it from combat, and heal all damage on it.) {2}: Knight of the Holy Nimbus can't be regenerated this turn. Only your opponents may activate this ability.