User blog comment:DaNASCAT/Technical Update: January 20, 2016/@comment-24531999-20160125214327/@comment-24531999-20160126134701

Well, we have images of cards from the game in this table. Rare and Epic cards have a orange or purple "glow" around around them that Common cards do not. This makes the Rare and Epic card images 1.09 times larger than the Common card images. I just wanted to get the scaling as precise as possible.