Cuzeg has 0 informed clue about the numbers sorry please ignore said number ramblings. As far as Elixer rarity goes however a major thing to remember is that as much as Elixers and Obsidians might be the same tier in their respective resources mythstones themselves are in fact just rarer then crystals in general although I do not have the specific numbers for you only @SteigerBox does and he likes to keep them to himself so you’re probably never going to get a more accurate response then “rare as butts” 
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