Covetous Urge

Theft effects in Dimir usually target the top of a library or a spell on the stack; this one reaches into what an opponent has already committed to keeping. Revealing the hand isn't just information: it's the menu. You get to pick the card the opponent most wanted to hold, whether it's sitting in hand or already discarded to the graveyard, and the hybrid mana in the cost means either color pays the whole freight, so no manabase excuse keeps it out of a deck. The color-fixing rider is the design payoff: whatever you steal, you can cast it later without needing its native colors, which quietly turns a two-color spell into a way to play a green bomb or a white sweeper you'd otherwise never touch. That clause pushes it past ordinary hand disruption. Duress trades one-for-one and the card is gone; this one denies the opponent the card and hands you the option to use it, with the timing left open (you may cast it for as long as it remains exiled, so a stolen instant stays an instant). The four-mana price and the sorcery speed are the counterweight: you're spending a turn to convert their best card into your resource, a tempo cost that keeps the effect from being oppressive while still paying off in grindy, attrition-based matchups where card quality decides the game.