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5* Mister Sinister

I recently got a 5* mister sinister after V4 exploration. The main question is whether he is worth a mutant awakening gem (I have 3). The secondary question is whether I should r3 or potentially r4 him. I think he’s a pretty good champ, and I like him in the comics, but I want to see what other people think. I also have no better mutants at the moment.
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See, in your case, if he's the best Mutant you have, you aren't in a bad spot. He's a good character
If you only had one Awakening gem, I would advise maybe holding it to see if a Namor or Sunspot came along, maybe an Iceman
But since you have three, I would use it without hesitation, especially if you like using him. I truly feel that he is easy to play, has good utility and absolutely can be an attacker with good production
Sinister doesn't have a bad kit at all. Just because it isn't one of the top 10 kits in the game doesn't mean it isn't a strong kit