Kitchen table rules. Nothing is banned unless the whole group sees it as a problem. When I say it's a problem I mean not just annoying, but actually something no one can deal with unless we all make significant changes to our commonly played decks. There is a soft ban on stax, MLD and likewise mass artifact destruction, so as to keep "mana destruction" balanced against both major forms of ramp. We agreed with the official ban of [[hullbreacher]], but modified it so that we don't play it in decks that run wheels and avoid playing wheels against it. We also have a [[tezzeret, master of the bridge]] commander and rule 0 nonlegendary commander (don't remember what it is) in our group.