Disembowel

The X here is not a measure of size; it is a precise dial that has to land on a single number. Where most scaling removal pays X for a range (deal X damage, give -X/-X), this one spends X to name an exact mana value and unconditionally destroys whatever sits on it. That makes it an oddly literal answer: you are not paying for a creature's toughness or its board impact, you are paying for the slot it occupies on the curve. Killing a creature with mana value four means setting X to four and paying , five mana total, whether the target is a fragile combo piece or a hard-to-kill monster, since "destroy" cuts through toughness entirely. The inversion is the whole point: the cheaper the target, the cheaper the kill, so this excels against the small, premium-statted creatures that out-rate their cost and grows steadily worse as the table's threats get more expensive. It is instant-speed and light on colored pips, which keeps it relevant as interaction, but the X-equals-exactly clause is the constraint doing all the work. Miss the number and the spell does nothing; the wrong board state leaves it stranded in hand. That granularity is rare in black removal, which usually prefers blunt instruments (kill anything, lose some life, pay a premium). This trades reach for thrift, asking you to read the curve and spend accordingly.