I’ve done like 20+ valley of pyramids and still not encountered a single cryptomid. Is the chance of a cryptomid appearing something like 1%?
If you use all your tickets on it you’ll get one every few days, on average 
Been doing exactly that for past few days. Ain’t got nothing but standard pyramids.
I posted elsewhere but I got multiple cryptamids in a row last month. Then no more since. Just gotta have the luck.