Commander players love their mana fixers and producers, and it looks like Chromatic Orrery is a perfect card for the format.
It can be used in decks with Kruphix, God of Horizons and change all the unspent mana from colorless cards into any colors you want. Also, it ramps significantly in decks that run Kozilek, the Great Distortion.
With Chromatic Orrery, you can cast Kozilek, a 10-mana commander, on turn four. Here's how to do it: