Divine Retribution

A punisher of overcommitment, scaled to the crime. The damage isn't fixed; it counts the attacking creatures and dumps that total onto one of them, which means the spell gets better precisely as the opponent gets greedier. A lone attacker walks through it for a single point; a full board swing turns it into a guillotine that can erase the biggest threat in the alpha strike. The counting is the entire engine, and the instant speed is what activates it: cast after the attack is declared and the size of the swarm is locked in, it lets the defender size the spell against the exact board they're staring down. The friction is that the card is dead against a measured assault and feast-or-famine against a swarm, since all that accumulated damage funnels into a single target rather than spreading across the team. It's a one-shot wrath that isn't a wrath: a board-reading exercise disguised as removal, rewarding the player who waits for the opponent to overextend instead of trading early. The wide, aggressive decks it's meant to hose are also the ones that can afford to lose a single creature to it, which keeps the rate honest. A clean expression of white's old role as the color that taxes ambition, written as a single conditional spell that only the attacker's own greed can sharpen.