Fume Spitter

A removal spell wears a creature suit here, and the disguise is the point. What you actually buy for one black mana is a -1/-1 counter held in reserve, attached to a body that can chump, attack, or just sit until the kill is needed. Because there is no tap symbol in the sacrifice cost, summoning sickness never applies: the Horror can come down and detonate the same turn, or wait with the counter ready at instant speed for the right window (a combat-math swing, an X/1 that wandered into range, a token that just needs to die). The permanence of the counter is what separates it from burn. A -1/-1 marker shrinks creatures that damage would glance off: a regenerator, something under a damage-prevention effect, a creature that has already eaten a point and just needs the last nudge. That is black's school of removal rather than red's, killing by subtraction rather than by points dealt. The dual identity, creature now and kill spell later, is why it slots so cleanly into decks already hungry for fodder: it pays its own way as a blocker or a sacrifice trigger before it ever spends itself on a counter. The 1/1 is the receipt, not the purchase.