There are about 7 main card sizes which are 4-Bar, A2, A6, A7, A8, A8 slim, and square all of which can cater to vertical or horizontal layout orientation
Be ready for an uptick in one of Magic's oldest tribes
With that in mind, here are some commanders I considered before deciding to try something different: Brago, King Eternal -- One of my all-time favorite commanders, Brago immediately came to mind for this deck, as he enables strong enter-the-battlefield synergies
This commander gets more powerful as your graveyard fills up with different artifacts, and you can make a very interesting artifact matters deck
Force of Will is the ultimate in safety, it is not the power of what it does for you when you finally cast it that makes it incredible but all of the things it lets you do with reduced risk because you have it in hand up to that point
Black wants to increase its power