We might be able to pull a good stunt here: using a grabow deck we could change it into a poison deck in the following round, for example. Unless we want to use the poison deck, ofc.
We could also change between a fractal deck and a quint phase shield one, but we don't have the cards anymore.
We have 25 surplus cards, that means that we should all be able to do some tricks if we can build our decks right. Any ideas?