Thank you TASOV for your sharing your experiences, I expected more NAGA's to be able to level them after being 2+ years in shop Lv.7 or plus but no luck.
Also, the only card that i have from shop Lv.8 has been GABRIEL few times which is not a very useful card but never a DEMON or other cards
Anyways, not to complaint a lot, it seems that with both the SHOP and the DROP RATE, there are some programming stuff that either gives goodies fairly well in few days and then becomes very rare in other times....