Plague Witch

Spellshaper was Nemesis's attempt to staple a spell's effect to a body, and this is the cheap, repeatable black version: pay a card and a black mana, tap, and hand a creature -1/-1 until end of turn. The math reads humble, and the design is built around iteration across turns rather than impact in any single one. As long as your hand holds fuel, the witch is a recurring shrink-ray, killing a 1/1 outright, softening a larger creature ahead of blocks, or tilting a combat math problem in your favor. The tap cost is the natural ceiling: one activation per turn, so the removal output is a slow drip rather than a burst. The discard cost is the structural valve that keeps even that drip honest: every activation drains your hand, so the engine punishes free use and rewards a deck that refills its graveyard or runs lean on cards anyway. That hand-as-ammunition tension is the whole Spellshaper conceit, and Plague Witch is its plainest black expression. The fragility is the other half of the bargain: a 1/1 that wants to sit back and activate is trivially answered, and an opponent who reads the board correctly trades it off before it ever costs them a creature. What it offers is not raw efficiency but a sustained, once-per-turn removal output bolted to a tiny frame, the slow-attrition tool of a controlling black deck willing to spend cards to deny creatures.