Cackling Fiend

Stapling a discard trigger to a zombie body is the kind of common-rarity design that shows up whenever a set wants to give black aggressive decks a little disruption without bending the curve, and this is a tidy early example of it. The body is fragile, but the trigger fires once on the way in regardless of how the 2/1 fares afterward: you pay for the creature and treat the discard as the real purchase. That makes it a Ravenous Rats effect that swings rather than blocks, which is a meaningfully different transaction than a bare discard sorcery, since the same mana now threatens two cards of value if the opponent has nothing to trade for the body. The cost of the upgrade is that it strips only a single card, and that the discard is undirected: the creature does nothing to choose what leaves the opponent's hand, so like every random-or-chosen discard of this kind it is strictly worse than the hand attack that picks. Black has revisited the stapled-discard template many times since, and the printed rates have improved as power levels generally rose, but the underlying logic has not changed: a discard effect becomes much harder to ignore the moment it also has to be killed.