I know I'm a little late to the Cubimal party, but I'm having the toughest time finding the Cubimal Series 1 set, differentiated by common and rare (I know the wiki site has the list, but not differentiated). I was able to find the Series 2 list in the forums, which I'll post here for posterity's sake and convenience for anyone else looking :)
Series 2:
*Common/Uncommon*
Groddle Street Spirit
Fox
Uralia Street Spirit
Fox Ranger
Gnome
Firebog Street Spirt
Sloth
Crafty Bot
Emo Bear
Ilmenskie Jones
Phantom
Butler
*Rare/Super Rare*
Senor Fun Pickle
Gardening Goods Vendor
Scion of Purple
Maintenance Bot
Meal Vendor
Tool Vendor
Trisor
Hell Bartender
I'll also include the Series 1 above once I get it. Oh, and if there's any further distinction to be made in the list above just let me know and I'll update that too! :D