Dial of Blood Transfusion

Sacrifice a creature, {t}: Create a 1/1 black
Blood Avatar creature token with, "{1}{x}{x}:
You lose X life and put X +1/+1 counters on
this creature at the beginning of the next end
step."
{4}{b}{b}{b}: Put the top two cards of your
library into your graveyard, target opponent
loses life equal to the power of target creature
you control.