I really am not an expert.. But from all those fairy pieces out there, the
Camel is probably one of the best to 'include' on a real functional
variant; that anyone more or less skilled could know and not think of
difficult to use in actual play..(?)
We also have the minimalists wizir, ferz or weak alfil, dababa.. Which
make for some very nice compounds; but this '2 pawn value' ancient chess
piece has something that makes for chess variant inventors include it very
often on their creations. No one seems to 'like' these guy, but he keeps
appearing! :-)