If you want to break the symmetry of this card, another easy way is to run this in a Bant deck with token doublers, Anointed Procession, Doubling Season, Parallel Lives, and even populate cards like Rootborn Defenses if the token is a creature
However, for Brainstorm to truly shine, you need some kind of combination of cards for it to be really good
Most platforms weren't built with actual printing in mind, so quality takes a nosedive the moment you hit 'download.' Snapshot fixes that completely
A wide variety of decks could want this as a role-playing mana rock, even at 3 mana
As another example, if my opening hand has a one-drop, a two-drop, a three-drop and four different four-drops, then I will usually bottom the worst three four-drops in the hope of drawing into a powerful five or six-drop, while keeping the cards that will ensure a perfect 1-2-3-4 curve-out