The "debate" about Brainstorm, cantrips, and blue in this format in general has been stagnant for years. There is literally nothing new one can say that has not already been said; the same arguments on both sides get trundled out every time, then people flame each other with increasing intensity until the announcement drops, and when nothing is changed they slink off to continue the cycle again later.
That is, if you’re pro-Brainstorm, you’re working with the following:
- Brainstorm is skill-testing;
- Anti-Brainstorm cards exist in the format (like Chalice);
- Non-blue decks can make top eight (cite recent T8 here);
- Brainstorm enables many different kinds of decks;
- Players are just results-chasers and could beat Brainstorm if they were less lazy/stupid/netdecking/whatever.
If you’re anti-Brainstorm, pick and choose from the following:
- Top eight data show that Brainstorm/Brainstorm decks are very dominant;
- Brainstorm reduces variance unduly (relative to non-Brainstorm decks);
- Historically, non-Brainstorm decks do not have much impact or staying power in the format, beyond the obvious issue with no Legacy deck ever truly being dead.
The rebuttals to all of these points are pretty straightforward, so I’m not really going to go into them at length here. As usual with these sorts of things, the sorts of arguments a person advances are less interesting as arguments and more interesting for what they reveal about the psychology behind making and managing a fun format. What do you want your format to be about? Arguments about deck variety usually carry some pretty hefty implicit assumptions. Is it more important for different styles of deck to be represented – that is, control, aggro, midrange, combo, etc. – or is color balance more important even if many of those decks end up being amorphous midrange blobs (see: Standard)? Adherents to the former will tend to favor the argument that Brainstorm enables many different decks, while proponents of the latter will see Brainstorm as an oppressive blue scourge. Similarly, arguments about variance and skill generally come down to whether you want to play chess or poker; that is, do you believe that there is any skill in reacting to random events, or do you believe that randomness is something that allows less-skilled players to steal free wins they shouldn’t have gotten?
Where you fall on those spectrums is probably a pretty good predictor of where you’ll land in the Brainstorm debate. There isn’t really a right or wrong answer to those questions because they’re mostly an issue of what an individual finds fun, and forcing people to give
a priori reasons why their version of fun is superior to all others is tedious and also an unhealthy thing to do in a gaming context.
In an ideal world I'd like to just impose a moratorium on discussion of this topic, but you really can't get away from how blue the format is if you know anything about it at all, so that policy would just turn into a protracted game of whack-a-mole with people's gripes (and spoiler season...oh god, spoiler season...). At least we have this thread as a quarantine zone.