Thanks for the report. It probably should be a 4* earth card. The designer will take a look at this when he is back in the office and determine the intended 4-star earth card. In the meantime, those who earned the 4-star dark maiden in the last war and definitely does not want the 4-star dark maiden can send us a replacement quest for the intended 4-star card via email at
support@playmage.com and include your 6 letter/digit game code (menu->friendship->search) in your request.
Update: The intended reward was a 4-star earth maiden