Lunge

Four total damage for three mana would be a steal on a clean burn spell, so the design splits the output into two halves that cannot be merged: two points must hit a creature, two must hit a player or planeswalker, and neither portion can be redirected to the other. That mandatory partition is the entire engine. It cannot dump all four at a face, cannot finish off a single large blocker, and it requires a creature on the battlefield even to be cast at all. If that creature is removed after the spell is on the stack, the spell still resolves and lands its two damage on the player or planeswalker, since it retains a legal target. Red has returned to this idea many times, taxing the all-purpose flexibility of burn by carving its output into fixed pieces; Char and Searing Blood each invent a different restriction to pay for the extra reach. What distinguishes this one is symmetry: the two halves are equal and inseparable, so the payoff arrives only when a small creature you want gone happens to share the board with an opponent you want pressured. With both conditions met, it is tempo and reach folded into a single instant. With only one, it is a spell waiting on a board state to complete it, which is exactly the friction the split was built to manufacture.