Worst Fears

Mindslaver got there first, but as an artifact you could reassemble and fire again. This is the one-shot sorcery rendition of the same total turn-control effect, priced at eight and exiled on resolution so it can never become an engine. What makes it singular among black's removal-by-proxy is that it answers nothing and produces nothing on its own board: it borrows the opponent's hand, library knowledge, attackers, and decision tree for a single turn and then vanishes. The value is entirely contingent on what they would have done and what you can make them undo: walking their own creatures into bad blocks, casting their counterspells into your held-up answers, sacrificing their engine pieces, discarding the bomb they were holding. That contingency is the design tension. A turn-control effect with no built-in payoff trusts the caster to manufacture the blowout, which is why it reads as a finisher only in decks that already have a way to convert a stolen turn into a closed game. The flavor lands cleanly on the mechanic: you are not destroying the threat, you are inhabiting the player and making them dismantle themselves, with the exile clause ensuring the nightmare is a single night rather than a recurring one.