Unicorn

{t}{3}{g}: Gain 2 Life
{t}{5}: Sacrifice Unicorn, return target creature in
your grave to hand. Lose 5 life
"The blood of a unicorn will keep you alive, even
if you are an inch from death, but at a terrible price.
You have slain something so pure and defenseless to
save yourself, you will have but a half-life, a cursed
life, from the moment the blood touches your lips."