Vladimir, Crimson Reaper

Deathtouch, lifelink
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
Whenever you gain life, create that many Blood tokens.
Vladimir, Crimson Reaper gets +1/+1 for each Blood token you control.