Brainbite

Targeted discard with a cantrip stapled on, sold at four mana because the card it costs you to play comes right back. The math is the whole pitch: a Mind Rot pulls two cards but leaves you down on resources, while a clean Coercion costs you the card you spend casting it. Here the replacement draw zeroes out that cost, so the spell is pure information advantage. You see the opponent's hand, you take the worst card for you (the removal, the sweeper, the combo piece), and you refill to the same card count you started with. The premium over a Duress or a Despise is the price of color, instant access to the full hand, and the cantrip that keeps you from falling behind on the exchange. The tension built into this kind of effect is symmetry of pace: it strips a card but never threatens the board, so it has to earn its slot by hitting something that would otherwise win. That makes it a card-neutral, hand-shaping tool rather than a swing, the sort of spell that reads as low-impact in a vacuum and overperforms whenever knowing and removing one specific card decides the turn it gets cast.