A white-blue-black that costs four total mana, hes a 3/3 with incredible abilities for being that mana-cheap, including First Strike, vigilance, AND menace
Engle Typal builds are one of the easiest ways to get into MTG, and especially with typal Commanders
These abilities work together great, as if Unesh manages to survive a single turn you're likely going to be able to unload two Sphinxes onto the battlefield, netting you a total of somewhere between two and six cards
Giving your team +2/+2 often buffs creatures enough to attack profitably, and its easy to spew artifacts across the board so the trigger deals lots of damage (which you can multiply with Furnace of Rath and Dictate of the Twin Gods), making Sentinel Sarah Lyons look like a powerful aggressive commander
Some of these can still be played in your MTG Arena decks, though several have also done time on an MTG banlist or two