Erm no, there are only fifty of them, I've counted the merged
also.
In all there are sixty five. doto the fact most of the heroes
can merege. if you
count the neospacians there are seventy. the main five are
avian, sparkman,
clayman, burstinatrix, and bubble man.
There are exactly 50 Elemental Heroes.
You can find a list of all Elemental Heroes in the related link
below.
Note: Not all of the Elemental Heroes are released (yet) in the
OCG.