Ive played cards like Brutal Cathar and Banisher Priest in Commander surprisingly often, and this is a steep upgrade
High-cost spells can win you the game, but they're likely to sit in your hand if you don't have the resources to cast them
TheRedMage on The "WTF is this crap?" 10 years ago I like mentioning Pale Moon as one of the most failed attempts at nonbasic hosing in a color that kinda likes nonbasics anyway (well, ok, except for Back to Basics)
A better Seedborn Muse is a risky investment, but only until the end of the turn you cast it, at which point it doubles your mana and gives you plenty of ways to interact
You can also recruit enemies with the Mediator's "Invite" ability or temporarily woo enemies to your side via the Thief's "Steal Heart" ability
This whole interaction of shuffling your library after you play Brainstorm is very common, and one of the main reasons to play this blue spell