Unholy Thirst

{b}, Sacrifice a creature: You gain life equal to the sacrificed creature's toughness.
"Anlovain was once a mortal mage like so many others- apprenticed, trained, and hungry for knowledge and power. While he was still flesh he claimed to have harnessed the ability to draw upon the energy of life without the aid of the houses of vampires. None among their number ever claimed to have given him their gifts and bore no curse but a hunger for life driven by his need for dominion."