They synergize well with the decks titular Leader card from 500 Years in the Future [OP-07] which allows the player to build a resource advantage by reducing the cost of opposing Characters
Not sure what your budget is, but other handy lands include Reflecting Pool, Field of the Dead (if you can swap out some lands for snow lands), Mana Confluence, Temple of the False God, the Fetches on-color (or even Prismatic Vista or Fabled Passage if you're basic-heavy)
One of my favorite things to do with new commanders is to try to force a creature type themed deck with them, and in this case a gnome deck could be a goofy alternative to the typical artifact build
Today an Gen Con, Wizards of the Coast hosted a panel on the design of the upcoming Commander 2019 product and revealed all four of the brand new commanders
By adding utility to our lands, like Raging Ravine, Ghost Quarter, and in this case Nurturing Peatland
With these out on the field, your opponents defender creatures become useless as they still cant attack