Master of Predicaments

A combat-damage trigger built as a coin flip the defender has to call, and the threshold (greater than 4) is the whole tension. The 4/4 flier is a real clock, and connecting once lets you secretly nominate a card in hand: if your opponent guesses its cost wrong, you cast it free. The design's genuine puzzle lives in that secrecy. You pick which card to wager, but your opponent never sees it, so the guess is a read on your hand state rather than the card itself. The natural instinct is to bank an expensive bomb and fire it off, but an opponent watching a top-heavy hand will simply call "yes," guess correctly, and leave you with nothing. The honest version asks you to maintain genuine ambiguity: keep a mixed enough hand that the cost of your wager card is a true unknown, so the call stays a real fifty-fifty. That makes it a rare creature whose payoff scales with the cost of what you sneak in, and whose body becomes incidental once the heist lands. Free-cast enablers usually route around mana on fixed terms: sneak-effects charge a set price, cascade randomizes the hit. This one hands the decision to the table and lets bluffing settle it. Everything hinges on the engine idling until it swings, though, so it demands a connection first: a flier that has to survive a turn cycle and then get through before any of the mind games begin.