If it is a very glossy card you could use PEC-12 which is a spray used by photographers to remove markings from photos. I spray it on a non-abrasive cloth or special wipes not the item. A non-abrasive eraser or artists gum eraser may work. You can get non-abrasive erasers, which are usually white, at Staples/Office Depot. Artist gum erasers at Michael's, Hobby Lobby or any art supply store. Another option is rubbing alcohol.
A good way to test is to take several low value cards from the same set and mark them and try various mediums.
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'Integrity is what you do when no one is looking'
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