Sam, Blood Addict

Sacrifice a Demon: Sam gains Hexproof
until end of turn. Each opponent loses 2 life
and you gain 2 life. Put a +1/+1 counter on Sam, Blood Addict.
At the beginning of your end step, if no
Demons died this turn, put a -1/-1 counter
on Sam, Blood Addict and you lose 2 life.