You'd burn out of mana pretty quickly if you only did that as Blood Price gives piddly amounts of mana back. That being said, it is good for blood generation for quietus which does get you mana. Likewise you're going to be needing syphon strike for that mana return so, no not really lol. You'll probably want to use The Blackest Night anyways since it's free defense and a quietus (which depending on the group will give you more mana in return).
