Expert-Level Safe

A vault that only opens when two people accidentally agree. The mechanic is a matching game lifted from game-show psychology: you and an opponent each lock in a number in secret, and a match cracks the safe, returning everything it hoarded to your hand. Miss, and the safe swallows another card off your library and dares you to try again. That framing makes it a genuinely unusual artifact: most exile-then-return effects run on a timer or a mana investment you fully control, but this one is gated by a mind game you can only ever half-steer. Because you own every card locked inside, the opponent has no stake in the payoff and every incentive to dodge your guess, keeping your own cards hostage indefinitely. The tension is not whether the payoff is worth it but whether you can read a person well enough to force the collision. It is a bluffing engine dressed as a value piece, and the failure state is punishing: each mismatch exiles a fresh card, so a losing streak actively deepens the hole and you can guess wrong into oblivion. Cards built around shared secret decisions are rare precisely because they hand the outcome to social dynamics rather than board state, and this one leans all the way into that discomfort. The safe is as much a test of your table read as it is of your deck, and it asks the opponent to play chicken with resources that were never theirs to begin with.