Against Time... Yep. RT. RT is a murderer of anything that gives buffs, so that's going to be an issue. Time is one of the more expensive elements, however. I believe denial should be the way to go. Earth/Water Tridents, perhaps? If I was playing time, I'd just pack in a few purifies and go monotime rush on us, and this works quite nicely against that.
Against Fire... We have to deal with large amounts of CC and dangerous stalling potential. Tempest (My water/entropy NT rush) has fared quite well against both the stall and rush of this element in the past. Thus, some form of NT rush would be my choice. Note I said rush; I don't think nymphcord is the best form of NT we can use versus fire.
Earth... Well. Earthquakes are going to go down, and I don't remember us packing in protect artifacts. An NT rush is out of the question. Given the beauty of four-pillar monoearth, I question the potential of denial against this, as well. I don't want to send in SoPa wardens against earth, as that would give it a kekking of fuel if we lost. A stall seems to be the answer, but... I'm just too worried about EQ. e.e
I question Spielkind's comment on life rushing us. Last war, they were extremely pro-stall, (Last two rounds, we lost simply because all our decks were stalls and all the elements we fought against were good at stallbreaking.) and unless Will is changing any of that, I think they'll remain that way.
That said, I'm struggling to think of what would happen should they bring a stall in and what we should do to counter it.
I feel speed poison should be what we use versus life.
Against death, well. Purifies are a lolling given. Bonewall has traditionally been quite threatening but shouldn't be too bad if we steamroll it with nymphs. I would personally say NTLA if we had it, but I agree with a fatter NT control deck, as Evans suggested.