First of all, money can't be sucked away by magnets. Don't worry, as long as the card has not been used by others, the security of funds can be guaranteed.

Secondly, it is estimated that your card has been degaussed, because there are magnets and other magnetic things in it. If it is an ordinary debit card, you can go to the bank to degauss or change the card (usually when the magnetic stripe is damaged and you can't add the card), but if it is a credit card, you can only call the credit card center, and there is usually a calling card at the back. They will reissue it for you after inspection. You can just cut out the magnetic stripe of the old card and throw it away, but there is usually a fee for changing the card.