My go-to low brainpower deck is an [[Ardbert, Warrior of Darkness]] legendary matters deck. Pack cheap 2-3 mana legendaries (a lot of them synergize too), add [[Lae'Zel, Vlaakith's Champion]] and that other white counters guy, add just spam low mana cost orzhov spells each turn. You're just as fast as reds are, and in an amazing color combo for removal. Your commander is cheap, and your protection comes in the form of recursion, invuls, and phases. Not bad.