In a previous post, we talked about the Bakuswap coming with Series 2d Gate and Ability Cards (24 of each).  The Bakupearl Bakugans come with Series 2b and 2c cards.

What about 2a?

There is in fact a series 2a, but it has an odd pattern.

One set of cards read x/15a and the other set reads xa/15.  The key is the “a”.

One of the cards, called Circle of Fire *should* be numbered 9/15a or 9a/15.  It is numbered 12/20a.

It is the only set with an truly odd number of cards.