Not I - in fact this is the first I've ever heard of it!
Loving fantasy since 1960 or so, FRPGs since 1975 (appx), and CRPGs since 1985....
When the Dark comes rising, six shall turn it back,
Three from the Circle, three from the track;
Wood, bronze, iron; water, fire, stone:
Five will return, and one go on alone.