Vraska's Finisher

The condition is the whole design: the enters trigger only reaches the stack if there is a damaged opposing creature or planeswalker to point it at. Enter with nothing wounded and there is no legal target, so the trigger falls away before it resolves, leaving a 3/2 that kills no one. That gate is what keeps a hard kill effect welded to a cheap body from being too clean. The flavor and the mechanic move together: the assassin arrives to finish something already bleeding, and the rules enforce exactly that fiction. The pairing it rewards is Rakdos aggression, where a scorched blocker or a first-strike attacker softens up a stabilizing threat and this closes out the exchange for the cost of a combat step. What it costs is timing and flexibility. This is sorcery-speed removal stapled to a summon, so it cannot be held as a response, and the damage has to be arranged before the creature ever touches the battlefield. That sequencing demand is where the card lives. As the payoff to a two-card plan it clears something resilient, with planeswalkers explicitly on the menu; without a wound already dealt, it is just a beater waiting on a setup that may never come.