While it's an expensive addition, it's worth the cost in any mill deck to throw in a copy of Bruvac, the Grandiloquent
Wizards of the Coast (WotC), has previewed a ton of new cards and detailed the mechanics included in Streets of New Capenna
Budget competitive decks are built almost entirely from Uncommon-and-below cards
This is just for new cards not the many repeats, and for formats like Commander, other Highlander and multiplayer formats and then also Five Color, Type Four, Peasant and Pauper and more
Whatever the situation calls for, you can be sure someone is drawing plenty of cards
You may have two commanders if one of them is a legendary creature with the choose a background ability and the other is a legendary Background enchantment