I could go to the elemental plane of earth and find a gold nugget larger than faerun.

I it is something like the cost of several horses to make rings of infinite create food/water.

The only things of any real value in dnd are trade goods with use value. Diamonds to resurrect people, dragon repellant, healing potions

My go to method for dealing with an evil king until the DM stops me is just creating infinite food to destroy the economy and bring about falgsc