Eldrazi Displacer would get better if I played Eldrazi Skyspawner and Archangel Avacyn instead of Matter Reshaper and Reality Smasher, but Matter Reshaper and Reality Smasher have impressed me, and Eldrazi Displacer should be good enough with Reflector Mage, Thought-Knot Seer, and Whirler Rogue
With that in mind, here are some commanders I considered before deciding to try something different: Brago, King Eternal -- One of my all-time favorite commanders, Brago immediately came to mind for this deck, as he enables strong enter-the-battlefield synergies
We've put together a complete list, showing off the cards and explaining their origins
It has some strong effects, but enough of a strong effect for 9 mana
You can off one player with damage/Commander damage and fling your creature at another player for lethal too
The best part of them though, is that your Creature spells cost one generic mana less to cast for each point of life your opponents have lost this turn