The card can be signed. The effect can be performed at any time in your act, with a deck in play. And it doesn't have to be a playing card. The Gold Standard can just as easily cause a signed bill to become impaled, or a business card - imagine handing out your card only to discover it pierced by your tie tack. When you remove the card, there's a hole running through it. You can then give that potential customer your business information with a permanent reminder of the effect he just witnessed.
This is an elegant quality prop, custom designed from the ground up, with attention to detail.