Yes, indeed, in theory I know very well that the new mana-2-summoners can be very useful. Unfortunately they cannot summon alpha edition monsters, and I simply lack SBD to buy and uplevel all the necessary beta cards. For now I just have to accept that you always beat my teams. :)
By the way, when exactly does the season end, so that one can get some extra booster packs?
It has just ended so you should refresh your screen and they will be there.