Could you tell us who else you have, so we could suggest if it is wise to use it on Namor, and eventually dump sigs on him or not?
I just got a natural dupe on him, and it is nice but not outstanding. For me mostly helpful for healing some light damage in AQ since generally I’m using others to clear lanes and bringing him in for the bigger fights.I’d reco holding it for a mutant that will be more game changing awakened - AA in particular, or Colossus or OR. If you don’t pull any of those three before you build a decent number of sig stones, use it on Namor.