Codie is another new commander from Strixhaven with huge potential.
It restricts you to play only sorceries and instants, and its mana base will require you to play lots of Mox artifacts just to be able to activate its ability.
But with all that work you will be able to do something amazing. For example, you could cheat the permanent spells restriction by using Hypergenesis that puts permanents onto the battlefield regardless of Codie.
In this way you could play any huge threat you wish, and then another one, and another one, and so on.