Uro, Titan of Nature's Wrath, one of MTG's best giants, provides so much steady value throughout a long game
Either way, after the madness card is cast and leaves the battlefield, it goes to the graveyard like a normal card
My favorite of these are oldschool commanders that have horrible weaknesses that you can turn into their greatest strengths: one of my very first decks, Karona, False God, is exactly this, where her downside of being passed around the table becomes a huge upside when I toss a Shiny Impetus on her and watch my opponents be forced to murder each other with her
It shouldnt be too difficult to swing in with a Dinosaur and cast multiple of its friends in the same turn to pull way ahead
For this list, each Commander can be built for $50 or less