i read the rules, so we have to discard the lost cards form the lost deck, then add the rest to the vault.
we have to salvage the cards we want and add them with the rest of the deck that won to the vault... so we get our 3 decks plus 18 cards back in the vault... we dont have to use the same decks... but yes, we can take our decks and let the 18 new left in the vault.
so i think we should try to take cards, with them we can build with 18 dditional cards from this round a new deck... a 4th.
the titan deck, i dont know what we should add.. perhaps qpillars, but i think its good as it is... miracle?
the entropydeck got not realy to salvage, perhaps darkness pillar or drainlife
dont know what will best, but i think, if we choose cards, we must use them next round for a 4th deck... but plz no suicide