Only exiling noncreatures is a touch restrictive, but its well worth the cheap cost, plus Haywire Mite synergizes with any cards that want cheap creatures or artifacts to go to the graveyard, and Urza's Saga or Trinket Mage find it
Three damage kills over 75% of my cube creatures
Elenda is sort of the Serra Ascendant for the zone, and gives you a very real commander damage win con with enough life and a combat trick like Kaya's Onslaught
More specialized reprints in Tales of Middle-earth 's Commander decks also see a lot of play, but only in the right builds
Then remove it from the removed-from-game zone and put it into the absolutely-removed-from-the-freaking-game-forever zone
A proper Jumpstart Commander Cube can be a mechanically cohesive, fun, and rewarding experience, especially when you can hone in on a single, fantastic set