Darth Vader, Sith Lord

Menace
Darth Vader, Sith Lord gets +X/+0, where X is
the amount of life you've lost this turn.
Whenever Darth Vader attacks, you may sacrifice another creature. If you do, you draw cards equal
to that creature's power and you lose life equal to
that creature's toughness.
"All I am surrounded by is fear. And dead men."