There are 62 common troops actually (not counting Guild troops)

[Fourdottwoone]

Took some digging around, here’s the post from Nimhain:

New Kingdom - Merlantis

So with the release of Merlantis, we now have more than 400 troops in the game. We’re going to revisiting event chests as a alternative means to dig out Commons and Rares in a future update.