Pardon the order that Imgur decided to put them in. Ultimately this deck was intended as a trade-off type deck:

• The 1/1 Broken Bones serve as fuel for other Undead via cannibalize, but of course killing them kills them. Logic: The Undead need to eat brains to survive, and The Forsaken have cannibalize as a racial in WoW. (I need to give the Broken Bones a flavor text that reads something like "Cannot damage other Undead." or something to that effect. Hindsight! Better Broken Bones.)
  
• The "Dies after two turns" minions were intended to be a little bit more powerful than their immortal counterparts but they're inherently short lived. Does your opponent kill them this turn (Small health pool anyway) or wait for them to die while leaving a tough minion on the board. Logic: Connective tissue breaks down along with everything else, skeletons fall apart.
  
• "Give a minion 25% chance to attack itself." Logic: Go to the Lordaeron throne room in WoW, turn up the volume on your headphones and listen to the whispers, those whispers are enough to drive a man (Or minion) mad.
  
• "This minion ignores Divine Shield." Logic: The Scarlet Crusade and The Forsaken are arch nemesis, The Undercity would have been crushed long ago if Divine Shield was at all useful against the Undead.
  
• "This minion cannot attack until its second turn." Logic: Self explanatory I think, useful for early/mid game, completely useless for extended play.
  

Obviously balancing, spelling, and grammar are all called for; plus I think there's room for a lot more variety. This was moderately haphazard in its creation, future additions will be more thematic. The Wrathgate is what I'm going to work with next, I've got some fun ideas in mind!