Temporal Extortion

The genius is in the politics. Most extra-turn spells are between you and the laws of physics: pay the mana, take the turn, done. This one inserts a referendum. The moment it goes on the stack, every opponent gets to vote with their life total, and the price of vetoing you is brutal: half their life, rounded up, which gets worse the longer the game runs and the more you've already done to them. A player at 40 pays 20 to deny your turn; a player at 12 pays 6 and might decide the extra turn hurts less than the bleed. That tension is the whole design. You are not buying a turn so much as daring the table to find your turn cheap. The "any player" clause is the sharp edge, because in a multiplayer pod the cost gets distributed: one opponent can eat the payment to protect the group, and you've spent four black mana to drain a single rival rather than to take a turn at all. The card sits with the rare effects that hand a decision to the people they're aimed at and let them set their own price for stopping you, a structural cousin to fight-or-pay cards like Browbeat in red. The quadruple-black cost keeps it honest as a mono-black statement: this is the color of life-as-currency saying so out loud.