Even without a dork, a mana doubler that comes with a dork to double is a huge pain
One other theme sometimes explored by this class is a savage resistance to technology, magic, and all the trappings of so-called civilization. While not a commander, the famous art and flavor text of Stranglehold capture the sentiment beautifully: Ruric Thar, the Unbowed is the ultimate wrecking ball of Barbarian commanders
It's also significant to use toploaders and sleeves that are of good quality, acid-free, so that there isn't any chemical reaction that will damage the cards in the long term
9 Tree Of Redemption A strictly defensive creature, Tree of Redemption is a 0/13 plant with defender for four mana
After tournament, I also went 2-1 against the Deck in a challenge match - there post-sideboard Dreams, Winds and Warp artifacs really pulled their weight