Cloudspire
If both the Retrofit Workshop spire capacity die and Upgrade Plans apply to the same spire, does adding an upgrade cost 1 or 2 Source?
Probably 1 Source. Upgrade Plans reduces the cost of upgrades added to the spire, and the Workshop's 2 Source is read as the base cost that the discount then lowers. A second reader holds that the 2 Source is fixed and cannot be discounted.