Originally Posted by
rogue.nine
Why do they have to red?
Well lots of color based hosers against blue exist:
Thrun, the last troll
Choke
Boil
REB/Pyroblast
spinal villain
seedtime
etc.
Of couse they're of varying quality...but if you want to be beat blue sideboard cards for that exist...if you don't mind them being a bit narrow.
That aside I would hate a ban on brainstorm it's probably my favorite spell and it makes people cry who use it in non force decks like TES/ANT. Although you are at least looking in the right direction when it comes to why blue is good: cheap draw filters for consistency and digging for answers.