The Dungeoneer’s cube is a one to two color commander draft format meant for 2-4 players. It heavily revolves around venturing into dungeons in order to gain advantages during your game.
Google docs to the cube guide: https://docs.google.com/document/d/1EEEGNTNjnhVQEy9eD3uRCywbRXUpqAKDQaud193Mitw/edit?usp=sharing
List of backgrounds to choose from: https://www.cubecobra.com/cube/list/24oxb