Last-Ditch Effort

The whole board, converted to a single number, pointed anywhere you like, for the cost of one red mana plus whatever you decide to feed it. The design is the all-in button rendered as an instant: each creature you sacrifice becomes a unit of damage, and the "any number" clause means you choose the scale, sacrificing one or two for a small burn or the entire team for a finisher. The targeting clause means that damage doesn't have to go at the player. It can clear a blocker, kill an attacker mid-combat, or burn out a planeswalker before the conversion. The instant speed is what separates this from a fizzled board: you wait until the stack or the combat step gives you the most bodies you're willing to spend (post-token-generation, after an attack already declared) and then cash out at the optimal moment. The self-limiting cost is built into the choice itself: every point of damage is a creature you no longer have, so the card only reads as a closer in a deck flooding the board with expendable bodies. That makes it a payoff looking for an engine rather than a card that stands alone, the natural cap on a go-wide red strategy that has already won the board presence battle and wants to translate it into a lethal number in a single instant. It rewards the position more than the play: the deck does the work, and this is the lever you pull when the work is done.