What do you do with commons ?
Merging them directly into big lvl spirit was expensive so i started merging 5 of them into uncommon and then merging that one US into target spirit.
Yea, this is what I do with my commons. Usually I merge commons into UC's until I get 5 UC's at Level 4 or 5 Then merge it into my main spirits. Saves me the Blue orbs and get more exp.