This is what I had for changes.
(Apologies the card should read “Figure you control” for the first power.)
I believe this version still captures the flavor I have been going for, but broadens the synergy to all Undead and simplifies the powers. I agreed with the defense change and that is reflected in the stats. I also changed the name of the first special because I like Kinseth's idea for the power name better. I limited his adding a figure to 1 per turn and allowed only 2 on his card.
One thing I did realize though is that as the card reads...his power will only allow him to attack 2 times if he kills on his first attack with his special. Currently it reads so that he can use the special attack without having a figure on his card, but he gets 1 additional attack for each figure on his card. But, even though he has 2 figures on his card, the first time he uses it and kills something he has to replace one of those figures, which means he'd only have 1 additional attack. If he missed on his first attack though, or it was blocked, then he would have 2 additional attacks. One way to avoid that would be to just add a "may immediately replace" clause, but then I believe most players would just opt to keep the figures on his card so he gets multi-attacks. I'm not sure yet if this makes him unnecessarily complex or if this would just be a feature of his design. My initial thought is that I need to find a way to avoid that complexity, but not sure yet. The may clause actually might be best because as a player I could replace 1 during my attacks and then my next turn suck him back up to max out my attacks again. Not sure...Thoughts?