Killian, Ink Duelist Killian is probably my favorite uncommon commander Ive seen for some time
The newer one is Nimble Obstructionist, from Hour of Devastation
Its hard to beat the original Olivia Voldaren with her ability to deal damage and steal things, but Olivia, Mobilized for War loves to hang with madness cards and Olivia, Crimson Bride can do fun reanimator things
Tricky Terrain is an easy A+ on value, but the actual strategy and card selection feels like it fumbled the ball somewhere
In fact, its my favorite (deserving to me explored more in future sets), although modular is kind of cool
For best results, speak the flavor text of Might of Oaks right as you cast it, preferably on the game-winning alpha strike