Brainstone

Take Brainstorm, strip its color, and let it sit on the battlefield as an artifact you cash in later: that is the design conversation this card is having with its blue ancestor. The classic instant draws three and buries two for a single mana at instant speed; this version charges two more mana and a sacrifice, but pays it back by living as a permanent until the moment is right. As a colorless artifact, it hands the Brainstorm effect to decks that have no business touching blue, gating card selection behind willingness to spend the extra mana and surrender the permanent. The sacrifice clause keeps it from becoming a fixture in every deck. You commit the artifact early, then choose when to pull the trigger, and once you do it is gone, so it functions as a one-shot smoothing tool rather than a repeatable loop. The interaction that gives it teeth is the same one that made Brainstorm a format staple: a way to shuffle away the two cards you tuck back turns the top-of-library placement from a liability into genuine fixing of your next several draws. Without a shuffle, you are stacking your own deck with dead cards; with one, you are digging three deep and clearing the chaff.