LogFAQs > #956316913

Part of me wants to say this should change very little. For the most part I think that the community as a whole has made some serious misevaluations about the Historic format overall and about Brainstorm specifically. That said, there probably are real changes just because the one deck that I think may actually be hurt by this also happens to be the most played deck.

Izzet Phoenix probably is hurt by this, less so because of Brainstorm specifically but more because there just isn't really another 1 mana cantrip. If you could play copies 5-8 of Opt instead then the deck is nearly the same. You can play Crash Through but that actually does feel like it might be too weak. If the mana for Abundant Harvest can work then that's also an option, but I suspect that may not possible. (For the record, I could easily see Crash Through being good enough anyways, though I could also see that not panning out)

Jeskai/Dimir control and Temur Creativity can no longer protect their hands from Thoughtseize, which is something. I don't think it's a huge loss, but in any case my opinion is that these decks were all basically unplayable anyways and will continue to be unplayable. Ironically banning Brainstorm may put these decks in a better place just because Izzet Phoenix is likely hurt more than they were. (Edit: Combo-esque decks like Creativity are hit harder than this suggests, yes. I was sort of ignoring it just because I think that deck is spectacularly bad anyways even in comparison, but I guess it's worth mentioning)

Jund Food is probably the #1 deck right now. I don't necessarily expect people to realize that since it's still been #2 since the release of Strixhaven and no one seemed to catch on, but who knows maybe people leaving blue decks in droves will be enough of a spark.
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I didn't do guru this year but azuarc can be in my sig anyways.