Murderous Compulsion

The "destroy target tapped creature" line is one of black's oldest discounts: the kill spell that costs less because it can only answer a creature after it has turned sideways to attack or spent itself tapping for an activated ability. That reactive window has always been the price, in the tradition of cards like Assassinate that trade flexibility for a cheaper rate. What this design layers on is madness, and the interplay between the two clauses is sharper than either alone. The tap requirement means the card is dead against a board that sits back with everything untapped: an aggressor who commits to the attack hands you the opening, but a defensive opponent gives you nothing to hit. That is precisely the situation where a removal spell tends to rot in hand. Madness gives the stranded card a second casting window: discard it to a looter or a rummaging effect and you can cast it for the same two mana from exile, provided a legal target exists when the trigger resolves. That caveat is load-bearing, because madness manufactures a casting opportunity, not a target; a board of untapped creatures still leaves the spell with nothing to point at whether it comes from hand or from exile. The card coheres around timing rather than around fixing dead draws: the tap clause converts an opponent's tempo into your window, and madness lets a discard outlet cash the card in on a turn you never planned to spend on sorcery-speed removal.