For a primer on the Battle Box format, I recommend this article:

https://luckypaper.co/articles/a-guide-to-battle-box/

This battle box is built using Snow lands for the basics and the Modern Horizons 2 artifact dual lands. It is a low power, budget environment. Cards in the Battle Box generally fall into one of two groups:

A. Cards that get more powerful / more interesting in a Battle Box format than in another limited or constructed format.
B. Limited pet cards that I can't find a home for in my cubes.

For a compilation of cards in the A bucket, see my Battle Box Maybeboard here:

http://cubecobra.com/cube/overview/1zshv

Here are a handful of other design notes:

• I am assuming players will use a shared library. I include a small number of cards that play in this space.
• The current iteration excludes all tokens for faster game play.
• Graveyard importance is minimized. There are no permanents that statically care about the graveyard (delirium, threshold, etc). There are no cards that can be cast from the graveyard or that bring themselves back from the graveyard.