you obviously don't like maths jerks >:(
another alternative is to go by spell card bonus, which while it has its limitations (EoSD rounds, PCB / IN / MoF have varied) is a consideration worth noting
(that, and there won't be silly debates like clear time vs. actual time and whatnot)
end-resources sounds like a nice idea, but going off that defeats the purpose of the challenge in the first place
the only reason why score was taken for fairy wars survival was because it was considered to be proportional to progress
ohai naut