Doing everything the majority of the economy of gold does (industrial uses can be ignored) better, except being shiny. If 'shiny' is your real argument then reconcile Pokemon Cards without ruining your argument.

"The economy of gold" doesn't do much of anything except extract wealth from a particularly extremist subset of "economic freethinkers" and my generation's parents when they watch too much Fox News, so I'm glad we're in agreement.

You can cheaply create more Pokemon cards while you actually need to mine the gold, no-one can't debase it at will.