Double post

I think what you would not be able to do is use Calculation to change multiple focuses to crits as that would fall in the 'once per opportunity' area

I'm not sure even that is right. Seems to me that triggering calculation and the opportunity to spend focus tokens normally are 2 different opportunities, even if they are very close together.

Yeah there is no way you would be able to loop the focus token to turn all eyeballs to crits. Passing it back and forth for one crit and again to turn the rest of the eyeballs to hits is plenty strong on it's own.