Sorin, Youngblood Upstart

0: Sacrifice a vampire you control. Put loyalty counters on Sorin, Youngblood Upstart equal to its power, then draw a card.
-X: Each opponent loses X life and you gain X life.
-8: You get an emblem with "During your end step, create X 1/1 black bat creature tokens with flying where X is the amount of life you've gained."