Hmm, well I might not have won, but I'm glad to see that at least the winner did the same deck I did :p I had planned to mod it for each opponent as well, and as both my opponents were Death element, I used purifies. Calindu also did pretty much exactly what I would have done had I been playing entropy. I'd definitely have done the rewind version of the deck and a grabbow (although I didn't consider using SoP; I used SoSe because all my water usually goes to forest spirits, but I never drew it in the one game I played with it, and that was against another grabbow anyway). The graboid deck looks good; I'd probably have tried something similar, but I likely would have done a few less graboids and added a black hole or fog or something else instead. (also, your deck should have had upped tower/mark split, lol :p)
I'd also have tried the DBH itr made, though I'd have used a 6th black hole instead of a charger, and maybe some other minor changes; same thing with the earth duo, I doubt I'd have used golems, but those are resilient enough against CC that I think it was probably a good idea. The darkness one seems obvious, too, though for some reason I don't think I'd have used it; I can't put a finger on why.
The really interesting one is that fallen elf deck; I'd never have thought to try a deck like that one. Depending on what the opponent was playing, that could've been a really good one. Against enough CC it would probably lose, but I bet it destroyed a lot of pure rushes.
As for wizardcat's decks, as I never even considered using fire (I don't really like fire as much as some other elements) I didn't think about what decks I would use with it. (whereas I did seriously consider entropy, and went away from it mostly just to be a rebel and because while discord is OP, it is also extremely obvious with entropy, although nobody seems to have countered it successfully; the other one I briefly considered was earth) I also really like upped air decks; unupped air has some things that annoys me, particularly the 1 cost dragonflies and the weakness of wyrms, but upgraded, it seems to flow a lot better, and air is in my opinion one of the most frequently underrated elements.