Special Weapon, Virus Buster (C)

Put this card into the soul of a 《Computer》on your field. If this card is in the soul of a 《Computer》, that card cannot be destroyed, and its souls cannot be put into the drop zone, by your opponent's card effects. When this card is put from the soul of a 《Computer》 into the drop zone, destroy a monster on your opponent's field. If you do, you gain life equal to the destroyed card's size.