Federalism

Wizards of the Coast, the company behind MtG
that is like the federal government, has a set of
rules that are used for tournaments and guide
gameplay. Casual players, the local governments,
can choose to modify these rules and/or make
their own. In this case, players can make their
own rules/laws, even if they do not comply
with Wizards rules, much like some U.S. states
legalizing marijuana, even though under U.S. law
it is illegal.