Braingeyser

Pricing the floor at two blue pips and letting the rest of the cost float on X is the design choice that gives this card its identity: at small X it is overcosted relative to any fixed-cost cantrip, but it scales linearly with mana into a game-ending refill, which is exactly the curve a control deck wants from its top end. The "target player" clause is the more telling design wrinkle, a vestige of early Magic's appetite for politically flexible effects and the same line that makes the card a build-around in multiplayer (gift the cards to an ally, deck an opponent who has milled themselves low). Stamped with the Power-Nine-adjacent pedigree of the Alpha blue suite, it has lived its competitive life alongside Stroke of Genius and Blue Sun's Zenith, both of which iterate on the template chiefly by moving the effect to instant speed: Stroke of Genius costs one mana more and buys you the right to refill on an opponent's end step, while Blue Sun's Zenith adds a shuffle-back clause that turns the spell into a recurring engine. The sorcery-speed version here is the reference point: the cleanest possible statement of the X-draw idea, and the card every subsequent designer of a blue card-draw finisher has had to justify their additions against.