Perish the Thought

Targeted discard like Thoughtseize and Duress already lets you see the whole hand and pick the card that hurts most; the distinction here is the destination. Instead of sending the chosen card to the graveyard, this shuffles it back into the library, and that tuck clause is the entire reason to play it. A card in the bin is a card a graveyard deck can flash back, reanimate, or escape; a card shuffled into the deck is gone from immediate reach and not guaranteed to surface again soon. Against an opponent leaning on a single irreplaceable threat or a recursion plan, denying the graveyard second life is worth more than the strip itself. What you give up for that upgrade is speed. At sorcery speed you spend a full turn for one-for-one disruption, with none of the proactive early-turn pressure discard usually trades on, and against an empty hand it accomplishes nothing at all. This is hand attack tuned for the long game rather than the opening salvo: a control-leaning answer that swaps the immediacy of a turn-one strip for keeping the chosen card out of the graveyard, at least for now, denying it an easy flashback or reanimation hit.