Endless Bloodlust

Reveal the top card of your library and put that
card into your hand. You lose life equal to its
mana value. You may repeat this process. If you
do, sacrifice a creature, mill a card, or discard a
card for each time you repeat the process.
Light: I've really had enough of these vampires...
Misa: I'm sorry, Light. But remember, they helped
to get rid of the dinosaurs...
Light: Don't even talk to me about dinosaurs.