Merrow Witsniper

Mill on a one-drop body sounds like an engine, but the single-card trigger keeps it harmless: one card off the top into the graveyard, once, when it enters. That gap between concept and output is the central design problem of mill as a small-creature ability. A self-mill build wants to fill a graveyard fast, and a card-per-creature drip never gets there; a true mill kill needs dozens of cards gone, and a 1/1 that buries one of them barely registers. What the trigger actually buys is choice of target: mill yourself to feed a graveyard payoff, or chip at an opponent who has set up something on top of their library. The Rogue typing is the tell that this was built to feed a tribe rather than to win on its own, where a critical mass of cheap bodies each trimming a card was meant to add up to a clock the individual triggers never threaten. As a study in how early mill resisted becoming a real strategy, the witsniper is honest about its own ceiling: the effect is too small to matter alone and too narrow to chain, which is precisely why it costs a single blue mana and stops at one.