Fathom Fleet Cutthroat

Removal stapled to a body, but with a precondition that turns it from a spell into a puzzle: the target has to have already taken damage this turn. That clause is the whole personality. Unconditional creature removal at this rate would be a slam-dunk; gating it behind prior damage makes this a finisher for a board state you have already started winning, not a way to break serve from behind. Because it lacks flash, the enabling has to happen on your own turn or on the way in: attack with a small creature, have it get blocked, and the blocker takes damage in the exchange; then follow with this post-combat to erase whatever survived. Any incidental ping effect works too, which means the reward goes to a deck already built to nibble at toughness rather than one hunting for a clean answer in a vacuum. There is a subtle wrinkle in how the trigger reads: the damage and the destruction do not have to come from the same source, so a fatty scratched for a single point and then hit by this is gone regardless of its printed toughness, sidestepping the durability that usually shields big bodies from cheap removal. The 3/3 still pays its way when the trigger fizzles, the concession that keeps the conditional from being a dead card. Bodies-with-strings removal like this tunes the restriction to make you build the value first, then collect it.