I believe this was for three main reasons: Their version of the deck was better versus Jund than I expected
For Unlimited and 3rd Edition, the main difference is that the inside border on Unlimited is double-beveled, while the inside border on 3rd Edition is single-beveled
Ramp & Mana Support
Kit Cloudkicker Spunky Bear Cub & Navigator Sapphire Kit Cloudkicker seems pretty strong, possessing Ward even as a one-cost character and then questing for three lore for only a Shift 3
The colors of Alpha and Beta cards could be muted, which is to the detriment of black cards, specifically, but that fade, coupled with the three dimensional beveling around the art and the text box, gives red cards, specifically, just a really nice pop in that thicker Beta frame
That massive buyout sent this cards Market Price spiking for the next two weeks