A Killer Among Us
The whodunit made mechanical: three suspects arrive together, and only you know which one is the killer. The hidden information is the whole engine here. Most token-and-counter effects tip their hand the instant they resolve, but this one parks its payoff face-down in your memory, and the sacrifice clause turns the reveal into a single, committed spring. Crucially, the buff fires only on an attacking token of your chosen type, which pins the card to your combat step: this is not a defensive trick you can spring on an incoming attacker, but a bluff you set up by swinging with all three bodies at once. Those tokens double as your legal-target pool and as decoys. The opponent has to guess which of the three attackers is the one carrying a hidden +3/+3 and deathtouch, and block accordingly. Read you right, and they trade for the fake suspect while the real killer walks in; overthink it, and they hand you the murder. The design is asking the player to lie convincingly across a combat step rather than sequence optimally, which is a register Magic reaches for only a handful of times. The friction is that you must actually attack to cash in, so the mind game costs you initiative if the opponent simply declines to block at all; the bluff only pays when they feel they have to guess.
