It was unfortunetly grossly overpowered. I'd like to see something a little less powerful. Like, at the beginning of an issue, declare a set of non-double d6 numbers. On any d6 rolls for that issue, if both of those declared numbers appear treat it as a limited double and roll an additional d6 and add it to the result. So, to summarize, if I have PM and declare "1" and "6" and at some point(s) in the issue roll that combination I can now roll 1d6 and add it to my result. Might be interesting.

Sorry if this has already been discussed. I tried a search but came up empty.