May I suggest a whole new approach, here is what I use in my Mono Death deck.
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![](http://s255.photobucket.com/albums/hh159/NeoToxicBlitz/?action=view¤t=DeathDrag2.png)
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It's a total speed deck, against AI (apart from gods) it is almost bound to win. Fully upgraded I have about a 70% win chance against L5's, around a 95% against L3's and the rest are 110%!
It is extremely dominant in PvP, I can normally win around 8 games in a row, if not more, before I get a bad hand, or a deck that halts me. Aether decks are it's weakness for sure, if you don't have a dragon and a couple of poisons in your hand at the start, then you might not stand a chance, but apart from that this has to be one of the fastest decks if seen in action. Maybe you should give it a whirl.
The Un-upgraded version works just as well, though I would personally stick to L3's at that point until you have upgraded about half of it, then go for some PvP grinding.
Here is what I'd use until you can get the Arsenic.
15 Bone pillars
6 Bone Dragons
5 Poisons
1 Aflatoxin
1 Plague
When you get one, remove the Plague.
I hope this helps.