You have several decent choices as your commander, but I feel the recently printed Astor, Bearer of Blades is the best of the bunch
In multicolour cards, there is at least one battle for each of the ten colour combinations, except white/black, which has two (Invasion of New Capenna, and Invasion of Tolvada)
This is another archetype that gets a lot of use out of Meticulous Excavation , as its ability allows you to functionally reset your unearth creatures and bring them back to your hand, ready to go again as soon as possible
This is the tenth outside-designer card
The abilities are quite appealing, and I especially like that the first one is tied to combat but doesnt need to deal combat damage to an opponent to get the benefit