Strictly, land banking means buying raw undeveloped land, making no improvements to it, collecting no income from it, and holding it for years on the expectation that development and population growth reach it and lift the value. That's your five acres held for eight years. In this room, that's what the term means.
The builder arrangement you read about is a different thing that borrowed the name. There, a capital partner takes title to finished or nearly finished lots and the builder holds an option to buy them back over time, paying for the privilege. That's a financing structure with income built in for the holder. Public land banks are a third meaning, where a city or county holds tax-foreclosed property to return it to use.
On taxes, vacant land is assessed and taxed. The bill is usually smaller than on an improved property because there's no building in the assessed value, and in agricultural states a qualifying use can reduce it a great deal more. It isn't zero, and it tends to rise as the surrounding area develops, which is the same trend you're betting on.
The part that surprises people is what you cannot do with land at tax time. There's no depreciation deduction, because land isn't a wasting asset, and how the property taxes and any interest get treated depends on your situation, so that's a question for a tax professional in your state.
Budget for the tax bill, any mowing or brush clearing the county requires, and the fact that nothing comes back in until you sell.