Hi Grga, the Gorgon Spearthrower (Academy Core promo) is actually level 2, it's only level 1 in spellbookbuilder.com.  The preview image they first released was incorrect and was later corrected.  Would be good to at least update the level and cost and if possible update the image as well.  An updated image can be found here for example: http://www.arcanewonders.com/wp-content/uploads/2015/06/PROMOScorrected.png

Great job on the builder, thanks for providing this.