Dalia the Bloodthirsty

When Dalia the Bloodthirsty enters the battlefield, you may sacrifice a creature. If you do,
put 2 +1/+1 counters on Dalia.
Whenever you sacrifice a creature, gain 2 life.
Whenever Dalia the Bloodthirsty deals damage to a target, create a blood token.
Sacrifice a creature: Destroy target creature.
{b}{r}: Sacrifice a blood token: Draw 2 cards.