Dusk Imp

A 2/1 flier for three mana with no second line of text is one of black's longest-standing fixed points in common-creature design, and Dusk Imp is about as undiluted as that point gets. No graveyard hook, no morph, no activated ability, no upside clause to argue over: just an evasive body cheap enough to fill a slot and small enough that nobody mistakes it for a finisher. Black has printed dozens of near-identical bodies over the years, each nudged a half-step in some direction (a death trigger here, a tribal tag there), and most have been forgotten because the point of them was never to be remembered. The Imp's distinction is exactly its lack of one. It is the control specimen, the baseline a designer reaches for when a black deck needs a flier and nothing more, the rate against which the cards that earn their text get measured. Three mana buys two damage in the air and a creature that trades up against ground-bound bodies; that is the entire transaction, and the honesty of it is the only thing worth saying.