Gastal's vampires took fuel from the dead.

Aetherdrift

Gas Guzzler

Start your engines (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
This creature enters tapped.
Max speed — {B}, Sacrifice another creature or Vehicle: Draw a card.

Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
This creature enters tapped.
Max speed — {B}, Sacrifice another creature or Vehicle: Draw a card.

Start your engines
This creature enters tapped.
Max speed — {B}, Sacrifice another creature or Vehicle: Draw a card.