It depends on what you're purpose is. Something like that I would assume is for shtf purposes. Seems like a good idea, but if someone came to you with a piece of "gold" they bent off a of a card like that would you trust it's value? Mint coins are easily recognized...its just the gold in them is worth a ton more than the face value. Then again in that situation a dollar might go back to what it was originally worth and a $20 gold coin in the correct face value.
If it's for wealth storage I still say stick with known mint coins.