It's difficult to say because it depends on how you play the deck. I have a Esper vampire deck that doesn't do much combat but its the effects that kill the opponent. Your deck is straight Orzhov so combat is almost a requirement. If you're going to fight with your creatures then give them the edge in combat, and if the allies are small then expect them to die if you're blocking big creatures. That's where
march from the tomb and
kalastria healer come in handy.