Additionally I think Nihilith should be included, especially since it's multiplayer and it's so easy to get out, particularly with Innocent Blood/Barter in Blood.
Personally, I don't think Woebearer is worth it, and you should also focus on getting Ink Eyes out on turn 5. So a turn 4 or less Fear creature will be good so as to not mess up your tempo. Nihilith already takes that spot as it should resolve before turn 4 or on it, but I think something like Dimir House Guard should be good as well, especially since it can fetch Barter in Blood on turn 3 (this can also be Mutilate, or if you're rich, Damnation). The House guard also can hit with Fear, allowing an easy Ink-Eyes on turn 5. Sounds good to me.
As for justifying the Woebearers, this deck is admittedly taylored to my usual group, and will see a lot of play against angels, big green, and infinite combos that rely on creatures to pull off. A lot of my stuff is going to die, (like the scions) but I'll need to keep bringing back marauders to sac to themselves to keep the board under control then go dig up the bodies and keep them.
"Whatever style you wish to play, be it fast and frenzied or slow and tactical, the surest way to defeat your opponent consistently is by dominating him or her in the war of card advantage." - Brian Wiseman, April 1996