Looking at options as of how to obtain blindsight as a wizard I was shocked to see that Blindsight, Greater in the SC revision is no longer on the wizards spell list. Since I remembered having a Wizard with that spell before I stumbled across the extended permancy list in Savage Species and there it was. Improved Blindsight used to be a wizard spell back in the days. Next thing I was looking in the errata of the SC assuming WotC simply forgot my lovely Wizard in the list. But no! The spell obviously got revised and Wizard intentionally left out on purpose. Is there any greater logic to that which I don't understand?