Menace is a great keyword to pair with the attack trigger, forcing two blockers from opponents and generally making sure these two brothers can safely get in the zone and provide value
Dragons of Tarkir gave us five newcomers (Dragonlord Silumgar, Dragonlord Atarka, etc.), Core Set 2019 gave us retrains of the originals (Arcades, the Strategist, Nicol Bolas, the Ravager), Strixhaven added five more as the namesakes of the different schools (Tanazir Quandrix, Beledros Witherbloom, etc.), and the five metal dragons from Baldur's Gate were also given the double creature type (Ancient Bronze Dragon, Ancient Copper Dragon, etc.)
The best +1/+1 counter Commanders come in a lot of shapes and sizes, and they often allow for different strategies too
You get two flying 4/4s out of the deal, and the bonus of your creatures gaining indestructible
The downside is youre limited to cards that actually have the printed madness ability, with only a few ways to apply that ability to other cards
By contrast, even the least interesting Commander 2016 deck is currently clocking in close to $100 retail