Fabricate is an extremely powerful ability that allows creatures such versatility. In the white-green deck, you're looking to leverage the different avenues of fabricate, whether that be putting +1/+1 counters on your creatures or producing Servo tokens. There are a multitude of powerful commons that get this job done, and there are even more powerful uncommons that can really abuse the fabricate creatures once on the battlefield. This deck has the capability of going wide with a bunch of creatures, perhaps finishing things off with the devastating Engineered Might, or creating a few creatures that are very large, such as Fairgrounds Trumpeter. I imagine this will be one of the stronger Draft archetypes, and that isn't a fabrication.