This is the deck I posted earlier, before I found a horrible mistake. So I built it again from scratch.
What got me started w/ the first version was when I opened what's-her-name--the 2 cost priest legendary. From there I found the cabal/scheme combo, liked it better (especially w/ all the goodies you can add to the combo itself--let alone the effects), and realized that I didn't want what's-her-name, anyway. Then I added something that screwed everything up, so I started over.
With the rebuild, I worked in that re-orderer; (I forget his name, even though I've already crafted him, so unlike the first version of this deck, I might actually be able to test this one). I made a point of capping card cost at 5 (or 6?), but I'm not married to that idea.
I admit that toward the end of creating this first (or second?) version, I basically just filled it in w/ various deathrattle cards, so I'm sure there's lots of room to improve there, as well. What I'm saying is, I'm going to keep working on this deck (especially since I think I have all the cards to actually test it), and I welcome any advice. (I'm already thinking of mulligan ideas too, of course, and with enough likes, I would probably feel compelled to write a guide for that. And other thoughts, too, I guess. Having never done this before, I just don't know what those magic numbers would be.)
EDIT: Before I even get started, I may as well admit an edit that I'm already going to do. I don't have Vectus crafted, so I'm going to substitute in Brightwing(?) instead. I suspect I might like that even better, too, so I might very well de-emphasize deathrattle all together; that ordering guy appears to be more and more central to a deck that began w/ a combo. (Of course, it would have to involve a key legendary--I just never found a combo that didn't involve the legendary DIRECTLY before.)