@The aresenic debate. I honestly really didn't think there anything that could replace two arsenics, buuut..
... The only difference I am running with a sanctuary instead of an arsenic. Mainly because I only had one arsenic to start with, but now I think it give you better control over aether-stallers (with a fog shield and this up you can survive for a long time vs a couple of astral dragons) and it is targetted by the AI for deflagration before the more important fog shield.
If you do get it early, it helps against nightmare-d GOTP and good quanta denial decks, which other wise this deck struggles with. Adding in another is probably over the top though.
^This gent here seems to be onto something. A sanctuary would make use of the unused light quanta AND shutdown gotp and devtal decks.
I think the key to replacing one or two arsenics is to make use of either death or light quanta, as they otherwise would do nothing. If you pick a card from one of those two elements to replace them, then you won't throw off the quanta balance. I've been running the deck with -1 arsenic +1 morning star, for example. Now I'm considering going -2 Arsenics +2 sanctuaries, though I'm not sure I would get the light quanta to play both, plus the lack of the poison based weapon would slow the rush a little.
Maybe..
-1 arsenic + 1 sanctuary
- 2 arsenic + 2 sanctuary
-1 arsenic + 1 poison
-2 arsenic + 2 poison
-2 arsenic + 1 deathstalker + 1 blessing (Someone elses idea)
Just to make a short list of potential combos for light/death.
EDIT:
-1 arsenic + 1 crusader? (Can endow with arsenic?!)
*Had first really good idea methinks*