So apparently I was arrested for possession of drugs in Canada

[phi2dao]

@runner pat

That would mean there are as many as 9,999,999,999,999,999 cards in the world, enough for appx. 14,000 cards per person worldwide.
The odds are long you could randomly guess a valid card number.

Actually, there are far fewer possible numbers. There is something called the Luhn Algorithm which is used to create most credit card numbers.