loud roost
When you beat ante 8, you should be given the option to save your current deck composition to a new deck, so you can replay an entirely new seed starting from your created deck.
As this is somewhat against the spirit of the game, I think it would be best if these custom decks were on a separate menu to the main decks, and didn't count for any achievements or unlocks. These should exist purely for experimentation.
Also you should only be able to save your deck at ante 8 and not in endless, so we don't end up with full baron-ready or idol-ready decks.
I just want some kind of way to preserve a very good run you've had.
gaunt geyser