Do whatever a counterfeiter would, it's not realistic to undo that sort of damage, just order a replacement card, they are constantly replacing lost or stolen cards and should be no big deal, all the account info should transfer to it.

One simple trick that often works is to rub the magnetic strip several times against your clothing to create static electricity.

Just report your card as faulty to your bank and they'll issue you another one.

Well, you know down at the scrap metal yard, they have that big electro-magnetic crane, for picking up stuff like old cars ?

By calling your bank and asking for a replacement one. When you get the replacement, you then destroy the old one with the bad magnetic strip.

Mutt tells you like it is, exactly. Listen to him.

Can't be done.

You cannot, the patterns are encrypted.