Target creature you control gains deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) and lifelink (Damage dealt by the creature also causes its controller to gain that much life.) until end of turn. If it's a Vampire, put a +1/+1 counter on it.
+1
You may sacrifice a Vampire. When you do, Sorin, Imperious Bloodlord deals 3 damage to any target and you gain 3 life.
-3
You may put a Vampire creature card from your hand onto the battlefield.