I’ve written posts before, but my suggestions would be to hit the “manabases” of every major deck:
Restrict Island-Type Duals (potentially Island Fetch lands as well)
Restrict Ancient Tomb (potentially workshop as well)
Restrict Narcomoeba (potentially powder as well)
A number of cards could potentially be removed from the restricted list at that point if you go with the one in parathenses as well, like Gush and Lodestone.
This achieves both “minimalist” as in a short list and creates diversity by forcing all the top decks to re-imagine themselves to some degree.