Special Weapon, Virus Buster (X2-BT01/0066EN) (X2BT01)

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