User blog comment:Buiquangduy/Major update incoming - will definitely have a new rarity/@comment-25420243-20141006060242/@comment-64.233.173.29-20141006093700

It's still intended for leveling your cards, after all it is a fusion/focus type card. Although it's skill is a atk buff, however I think it'd be a similar case like Gold Rush - stats like a N card, making it useless and solely for fusion. Why do you need a SR slime for your URs? With the new rarity, you'll probably need 10 of N slimes, so maybe one SR slime will supply enough EXP to max it.