Fetid Imp

The math is the appeal, and the math is binary: one black mana flips this from a fragile 1/2 flier into something nothing on the ground wants to walk into. The activation is a switch, not a dial; a second or third black mana buys nothing, because deathtouch does not stack and one point of damage is already lethal to any blocker. What you are paying for is the option held open, not a scaling threat. So the imp does double duty without asking for more: it pressures from the air on the turns you spend your mana elsewhere, and on the turns you leave a single black source untapped it becomes a tax on the opponent's attack step, a creature they would rather not trade into. The reusability is the quiet strength. Because the deathtouch is an activated ability rather than a counter or a one-shot effect, the imp keeps offering the same threat turn after turn, no equipment or pump spell required, never aging into a dead draw once the board congeals. This is clean common-rarity construction: a cheap evasive body given just enough late-game relevance to stay live, with a frame small enough that the activation can never snowball into something the format has to fear. Nothing flashy, and nothing meant to be. It exists to give black's aggressive draws a flier that also stalls the ground, and it does exactly that.