the deck builder is very confusing as far as set up, and the filter is not working at all. Name the bakugan by "B" then a name, this would make finding bakugan a bit better. also not all cards are entered, but thats okay, as this is beta 
As stated only 15a and 48b cards are entered for now. Also you can search bakugan by g-power or the "expansion" they are from..... S1 for series one, S2 for series 2, BP for bakupearl, BC for Bakuclear and BS for Bakuswap. So far all of the bakugan start with either "B2" or "original" so you could also probably just search that as well. I think for the next update i may make ALL bakugan begin with a "B" like you suggested