I'd agree with sign in blood, 2 mana for 2 cards and 2 damage, has the potential to win the game lol, not likely though, but the extra two cards will get you rolling. As for the mana cost of Phage, you have 4 dark rituals lol, I don't think it'll be much of a problem. Adding a Corpse Connoisseur or 2 will help with those games where you just didn't draw the guy you needed. Him mixed with Lord of the Undead, you can plan combos. Gravepact is also a considerable option here. Living End + Corpse Connoisseur can make a decent combo, though cause of suspend, there can be a decent reaction.
Permalink
Have you thought about adding Corpse Connoisseur? Maybe with Phage.
My buddy uses this one against me(netdeck version), when done right I'm down 20 life on turn 7. Can't holy day that one.