That commander is Tannuk, Steadfast Second, a Kavu Pilot that can cheat out red creatures or artifact cards for a reduced cost, and gives everything haste
At the beginning of each end step, if a card left your graveyard this turn, Gau deals damage equal to its power to each opponent
That being said, don't let my personal lack of enthusiasm for this deck deter you
Augment creatures like Half-Squirrel, Half- have to be played over a host creature
Whereas normal version of RUG/Arabian Aggro can easily lose to the card, this version at least plays a mix of countermagic to handle critical threats like The Abyss, and after sideboard you can also bring in things like Tranquility, Whirling Dervish, and Concordant Crossroads (which acts as a one mana removal spell for The Abyss because they are both Enchant Worlds, and also makes all of your attackers hasty, shortening the clock)