Mindblaze

A wager dressed as a burn spell: you name a nonland card and a number, then bet that an opponent's library holds exactly that many copies. Guess right and they take eight, more than enough to close most games. Guess wrong, which is nearly always, and you have spent six mana to shuffle their deck for them. It reads as a puzzle rather than a tool, the kind of effect whose payoff exists precisely because the condition is almost impossible to satisfy in real play. The honest use case is razor thin: even with perfect knowledge of a four-of playset, every draw, fetch, and tutor shifts the count the instant the game moves, and the library you are guessing about is the one part of the board state you are least equipped to track. What keeps it a curiosity rather than pure novelty is that it does reward perfect information: in a mirror where you know the list cold, or against a library thinned to a known quantity, the eight damage becomes a real line, just one that demands bookkeeping no spell should reasonably ask for. It comes from an early design moment still feeling out how much a damage-dealing sorcery could ask a player to track, and the answer it landed on was "more than anyone will."