Gas Guzzler

Black has never had trouble printing one-mana bodies that eat creatures for cards; the twist here is a payoff gated behind a resource you can only build by putting an opponent under the knife. The sacrifice-for-a-card engine stays dark until you reach max speed, and speed climbs only when an opponent's life total drops on your turn, so the card demands you draw blood early (through combat, burn, or drain) before it hands you its best mode. That gating is deliberate: the vampire enters tapped, leaving it unable to block the turn it arrives, and in exchange the engine only comes online for a deck already winning the life-total race. This puts it in the lineage of black's cheap sacrifice outlets that turn expendable bodies into resources (Viscera Seer smoothing draws, Carrion Feeder growing itself), but where those work the instant they hit the board, this one refuses the job early and asks to be earned. The outlet also accepts Vehicles, not just creatures, which lets it double as a sacrifice engine in a deck built around crewed threats. The result is a creature that is a dead topdeck on a stalled board and a repeatable draw loop once the pressure is flowing, which is exactly the split the speed clock is built to enforce: reward sustained aggression, punish the grind.