Pulse of the Forge

A burn spell that bills itself to the player who is ahead. Four damage is a fine rate for three mana, but the recursion clause turns it into a weapon scaled to the matchup: against an opponent at a higher life total than yours, it returns to your hand and demands to be cast again, so a single copy can throw twelve, sixteen, twenty damage over a game as long as you stay behind on life. The mechanism only stops working once you have pulled even or ahead, by which point you no longer need a repeatable nuke. That is the design tension the card resolves: it rewards the desperate position and quietly switches off when you are winning, so it never becomes a redundant top-deck in a game you already control. The strict no-creature targeting is what pays for the engine; this is a spell aimed at faces and planeswalkers only, never a creature answer, which keeps it from being the kind of efficient repeatable removal that warps board states. It sits among the cards that close out a stalled or losing race by converting your own life deficit into recurring reach, and it does that job with a cleaner loop than most: no graveyard recursion, no buyback cost, just a comparison check evaluated on resolution and a return clause that fires whenever the math still favors you.