I'm bringing $20, and my Visa.
:-)
Where-when would you use the Visa?
Much better to start with some nondescript gold coins, and a stack of parchment forms.
Pick a nice bank and make a deposit, then come back in fifty years saying, "My grandparent wants to close out the account. Here is the authorization. You can see that the signatures match."
After you've done this a few dozen times, you can buy anything you want.