Fair warning, this can change if you want it to, but barely alive is alive enough for his powers to function, so if ya want to kill someone when he's around, you really have to kill them dead.
@Isaac
I don’t know what Mintz reaction will be but I can certainly say for myself that I would be very against time altering powers. It again, can usually fall under rule three of godmodding for obvious reasons (such as abusing it in every situation as one example). Also, no one wants to play the freeze game or re-write a scene again with a different outcome. The machines needed for writing the power would probably get annoying for other players.
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Assuming it were allowed:
Striker would be the core rating, since the power requires touch to even do anything.
Secondary rating would be Trump, since technically, this sounds like it can grant effective superspeed. Power-granting is Trump.
Assuming by "reverse time", you mean it displaces them back to a position/state along their own personal timeline without actually reversing time as a whole, then yes, it might provoke a Mover rating as well, especially in a personal capacity. Rating number/intensity would depend on how far back the PC could rewind.
As far as can be told, there's no specific combination of power ratings that never end up together. There's some unlikely/uncommon combos, but having a classification in one power type doesn't necessarily preclude having another.
There also might be a Brute rating for the effective self-healing it sounds like this would do.
So, in summary: Striker/Mover/Brute/Trump, possibly with a small side of Breaker.
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Cool. You have my permission to include that in your post. The others can choose whether or not to have their characters join in beating up on it alongside the Adventurer.