Silumgar Butcher

Exploit turns a sacrifice into a payment, and this is the design that spends that payment on removal. The mechanic is conditional: the trigger only fires if you actually sacrifice a creature, so the -3/-3 is something you choose to buy, not something the card hands you for free. That structure makes the card a two-for-one waiting to happen. Sacrifice a creature that has already done its job (a dying token, a spent value engine, something carrying a death trigger of its own) and you convert a body that was about to be useless into a kill spell for almost anything on the board. Against an empty field, decline the exploit and play it as a plain 3/3, so the card is never stranded when there is nothing worth trading. The -3/-3 size is the telling number: enough to drop most midsized creatures and to gang up with a point of incidental damage against larger threats, but capped so it cannot erase the biggest bodies on its own. It is black's recurring trick of paying life or creatures to push a removal effect onto a stick, here folded into a keyword that rewards a board already built to feed it.