Scepter of Fugue

The recurring discard engine, distilled into an artifact that any black deck can carry without spending a creature slot on it. Where most repeatable hand attack lived on bodies (the Hypnotic Specter line, Liliana of the Veil's static drain), this puts the effect in a permanent that survives board wipes and creature removal, asking only that you pay the tax each turn and accept the activation window. That window is the load-bearing restriction: locking the ability to your own turn strips out the response-baiting and instant-speed plays that would make a repeatable Mind Rot oppressive. You cannot fire it on an opponent's draw step to strand a fresh card, and you cannot hold it up as a bluff. It is a grinding tool, not a reactive one, built to bleed an opponent dry over the long game while you keep your own resources intact. The recurring cost (one and a black per activation, plus the tap) means it is never free, and against an empty hand it does nothing but ask whether you had something better to spend that mana on. This is attrition hardware in the oldest black tradition: the slow, inevitable card-advantage engine that never wins on its own but makes every turn the opponent spends rebuilding cost a little more than the last.