Athreos, God of Passage Often used in decks that focus on sacrificing creatures for various benefits, such as triggering death effects or gaining life, Athreos is a legendary enchantment creature with a casting cost of 1 colorless, 1 white, and 1 black mana
This allows her to serve as the perfect stax commander, like Leovold, making it easy for her controller to lock other players out of the game, and preventing them from getting any kind of foothold on the board
There are some static sources, but you arent going to be able to get enough energy without constant spellcasting
In EDH it's impossible to play a 200+ card deck due to the rules of the format, but in its Standard format, Battle of Wits decks were somewhat competitive