FireOne reasonable choice here would be the earth duo with stone skins and titanium shields. The deck would be strongest with bone walls; that failing, though, four skull shields could be enough along with two tits.
Another possibility here would be a fractal deck with viruses, bone walls, and 2-3 upped recluses. This tests pretty well vs most of their remaining decks.
UnderworldI expect UW to pack a purify or two against us, so we should use poison elsewhere. The fire duo MrBlonde suggested should rip up many possible UW decks, so I'll vote for that. I am not sure how the earth stall would do vs UW (doesn't seem amazing, but could work).
AetherThe most likely decks from Aether: fractix, pestal, or poison stall; grabow actually seems likely as well. I think they will expect us to bring the earth stall against them again, since that worked last time - let's
not use the earth stall here.
Here are the options I like vs aether:
a straight up poison deck with dim shields and lightninga fractal recluse rush (possibly with viruses and bone walls), assuming we don't use this vs firea darkness duo - we can salvage a number of interesting darkness cards, including 4 steals, 5 devourers, black dragons, liquid shadow, eclipses - in particular, perhaps we could build a bone/black dragon LS deck with steals. Eclipse brings both dragon types to 6 hp (resisting lightning), and LS can be used in case we need the healing vs a grabowmaybe a fire duo