Their dischole is gone, which is great news for us. The smartest move for them seems to be to keep the discords from the deck. Same thing for the grabbow they played.
From R1 they could have salvaged some extra novas, but they have 3 grabboids tops (unless they give up 3 discords, that way they could get 6) and maybe some extra utility cards that they have kept from their initial vault.
They may have spare fractals and dims, salvaged from R2 and R3 too. So if they wanted, they could keep their dragontal.
Pandebonium is probably gone too, as well as their darkness duo.
RT splash came back after R1.
Their AM/nymph/diss deck is still alive.
From salvage of the last 2 rounds they could build a wings splash and if they have the novas for it, an UG deck.
Since they went 1-5 and lost a lot of novas, QP and low cost cards ; they'll have to make a lot of conversions. They'll field 5 decks next round.